diff --git a/pyproject.toml b/pyproject.toml
index 502d9e23..4eb07be8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ dependencies = [
     "transmission-rpc",
     "authlib>=1.6.6,<1.7",
     "apprise>=1.9.0",
+    "Pillow>=11.0.0",
 ]
 
 [project.optional-dependencies]
diff --git a/shelfmark/core/image_cache.py b/shelfmark/core/image_cache.py
index 1aeb0fdb..d9b481c7 100644
--- a/shelfmark/core/image_cache.py
+++ b/shelfmark/core/image_cache.py
@@ -49,6 +49,9 @@
 
 _MIN_WEBP_HEADER_LENGTH = 12
 HTTP_NOT_FOUND = HTTPStatus.NOT_FOUND
+MAX_VARIANT_DIMENSION = 1024
+WEBP_DEFAULT_QUALITY = 80
+JPEG_DEFAULT_QUALITY = 85
 
 
 def _detect_image_type(data: bytes) -> tuple[str, str] | None:
@@ -72,6 +75,164 @@ def _detect_image_type(data: bytes) -> tuple[str, str] | None:
     return None
 
 
+def normalize_variant_dimension(value: object) -> int | None:
+    """Normalize a requested variant dimension, clamping to a safe upper bound."""
+    dimension = coerce_int(value, 0)
+    if dimension <= 0:
+        return None
+    return min(dimension, MAX_VARIANT_DIMENSION)
+
+
+def normalize_variant_format(value: object) -> str | None:
+    """Normalize a requested output image format."""
+    if not isinstance(value, str):
+        return None
+
+    normalized = value.strip().lower()
+    if normalized in {"jpg", "jpeg"}:
+        return "jpeg"
+    if normalized in {"png", "webp"}:
+        return normalized
+    return None
+
+
+def build_variant_cache_id(
+    cache_id: str,
+    *,
+    width: int | None,
+    height: int | None,
+    image_format: str | None,
+) -> str:
+    """Build a cache key for a derived cover variant."""
+    width_token = str(width) if width is not None else "auto"
+    height_token = str(height) if height is not None else "auto"
+    format_token = image_format or "original"
+    return f"{cache_id}__w{width_token}_h{height_token}_f{format_token}"
+
+
+def _calculate_variant_size(
+    *,
+    source_width: int,
+    source_height: int,
+    width: int | None,
+    height: int | None,
+) -> tuple[int, int]:
+    """Calculate the output size while preserving aspect ratio and avoiding upscaling."""
+    if width is None and height is None:
+        return source_width, source_height
+
+    width_ratio = (width / source_width) if width is not None else None
+    height_ratio = (height / source_height) if height is not None else None
+
+    if width_ratio is not None and height_ratio is not None:
+        scale = min(width_ratio, height_ratio, 1.0)
+    elif width_ratio is not None:
+        scale = min(width_ratio, 1.0)
+    elif height_ratio is not None:
+        scale = min(height_ratio, 1.0)
+    else:
+        scale = 1.0
+
+    return (
+        max(1, round(source_width * scale)),
+        max(1, round(source_height * scale)),
+    )
+
+
+def _normalize_source_format(image_data: bytes) -> str | None:
+    """Return the normalized detected source image format."""
+    detected = _detect_image_type(image_data)
+    if not detected:
+        return None
+
+    content_type, _ext = detected
+    if content_type == "image/jpeg":
+        return "jpeg"
+    if content_type == "image/png":
+        return "png"
+    if content_type == "image/webp":
+        return "webp"
+    return None
+
+
+def create_image_variant(
+    image_data: bytes,
+    *,
+    width: int | None = None,
+    height: int | None = None,
+    image_format: str | None = None,
+) -> tuple[bytes, str] | None:
+    """Create a resized and/or transcoded image variant.
+
+    Returns None when no variant is needed or the image cannot be safely transformed.
+    """
+    requested_format = normalize_variant_format(image_format)
+    if width is None and height is None and requested_format is None:
+        return None
+
+    source_format = _normalize_source_format(image_data)
+
+    try:
+        from PIL import Image, ImageOps, UnidentifiedImageError
+    except ImportError:
+        logger.warning("Pillow is not installed; serving original cover image")
+        return None
+
+    try:
+        with Image.open(BytesIO(image_data)) as source_image:
+            if getattr(source_image, "is_animated", False):
+                return None
+
+            image = ImageOps.exif_transpose(source_image)
+            source_width, source_height = image.size
+            output_width, output_height = _calculate_variant_size(
+                source_width=source_width,
+                source_height=source_height,
+                width=width,
+                height=height,
+            )
+
+            needs_resize = (output_width, output_height) != (source_width, source_height)
+            output_format = requested_format or source_format
+
+            if not needs_resize and output_format == source_format:
+                return None
+
+            if needs_resize:
+                image = image.resize((output_width, output_height), Image.Resampling.LANCZOS)
+
+            if output_format == "jpeg":
+                if image.mode not in {"RGB", "L"}:
+                    image = image.convert("RGB")
+                content_type = "image/jpeg"
+                save_kwargs: dict[str, Any] = {
+                    "format": "JPEG",
+                    "quality": JPEG_DEFAULT_QUALITY,
+                    "optimize": True,
+                }
+            elif output_format == "png":
+                if image.mode not in {"1", "L", "LA", "P", "PA", "RGB", "RGBA"}:
+                    image = image.convert("RGBA")
+                content_type = "image/png"
+                save_kwargs = {"format": "PNG", "optimize": True}
+            else:
+                if image.mode not in {"RGB", "RGBA"}:
+                    image = image.convert("RGBA" if "A" in image.getbands() else "RGB")
+                content_type = "image/webp"
+                save_kwargs = {
+                    "format": "WEBP",
+                    "quality": WEBP_DEFAULT_QUALITY,
+                    "method": 6,
+                }
+
+            output = BytesIO()
+            image.save(output, **save_kwargs)
+            return output.getvalue(), content_type
+    except (OSError, UnidentifiedImageError, ValueError) as exc:
+        logger.warning("Failed to derive image variant: %s", exc)
+        return None
+
+
 class ImageCacheService:
     """Persistent image cache with LRU eviction and TTL support."""
 
diff --git a/shelfmark/main.py b/shelfmark/main.py
index 66837114..777fbea2 100644
--- a/shelfmark/main.py
+++ b/shelfmark/main.py
@@ -1597,6 +1597,9 @@ def api_cover(cover_id: str) -> Response | tuple[Response, int]:
 
     Query Parameters:
         url (str): Base64-encoded original image URL (required on first request)
+        w (int): Optional max width for a derived image variant
+        h (int): Optional max height for a derived image variant
+        format (str): Optional output format for a derived image variant (webp/png/jpeg)
 
     Returns:
         flask.Response: Binary image data with appropriate Content-Type, or 404.
@@ -1606,43 +1609,84 @@ def api_cover(cover_id: str) -> Response | tuple[Response, int]:
         import base64
 
         from shelfmark.config.env import is_covers_cache_enabled
-        from shelfmark.core.image_cache import get_image_cache
+        from shelfmark.core.image_cache import (
+            build_variant_cache_id,
+            create_image_variant,
+            get_image_cache,
+            normalize_variant_dimension,
+            normalize_variant_format,
+        )
 
         # Check if caching is enabled
         if not is_covers_cache_enabled():
             return jsonify({"error": "Cover caching is disabled"}), 404
 
         cache = get_image_cache()
+        width = normalize_variant_dimension(request.args.get("w"))
+        height = normalize_variant_dimension(request.args.get("h"))
+        image_format = normalize_variant_format(request.args.get("format"))
+        variant_cache_id = (
+            build_variant_cache_id(
+                cover_id,
+                width=width,
+                height=height,
+                image_format=image_format,
+            )
+            if width is not None or height is not None or image_format is not None
+            else None
+        )
 
-        # Try to get from cache first
-        cached = cache.get(cover_id)
-        if cached:
-            image_data, content_type = cached
+        def make_cover_response(
+            image_data: bytes,
+            content_type: str,
+            *,
+            cache_status: str,
+        ) -> Response:
             response = app.response_class(response=image_data, status=200, mimetype=content_type)
             response.headers["Cache-Control"] = "public, max-age=86400"
-            response.headers["X-Cache"] = "HIT"
+            response.headers["X-Cache"] = cache_status
             return response
 
+        # Try to get from cache first
+        cache_lookup_id = variant_cache_id or cover_id
+        cached = cache.get(cache_lookup_id)
+        if cached:
+            image_data, content_type = cached
+            return make_cover_response(image_data, content_type, cache_status="HIT")
+
         # Cache miss - get URL from query parameter
         encoded_url = request.args.get("url")
-        if not encoded_url:
-            return jsonify({"error": "Cover URL not provided"}), 404
+        original: tuple[bytes, str] | None = cache.get(cover_id) if variant_cache_id else None
 
-        try:
-            original_url = base64.urlsafe_b64decode(encoded_url).decode()
-        except (binascii.Error, UnicodeDecodeError) as e:
-            logger.warning("Failed to decode cover URL: %s", e)
-            return jsonify({"error": "Invalid cover URL encoding"}), 400
-
-        # Fetch and cache the image
-        result = cache.fetch_and_cache(cover_id, original_url)
-        if not result:
-            return jsonify({"error": "Failed to fetch cover image"}), 404
-
-        image_data, content_type = result
-        response = app.response_class(response=image_data, status=200, mimetype=content_type)
-        response.headers["Cache-Control"] = "public, max-age=86400"
-        response.headers["X-Cache"] = "MISS"
+        if original is None:
+            if not encoded_url:
+                return jsonify({"error": "Cover URL not provided"}), 404
+
+            try:
+                original_url = base64.urlsafe_b64decode(encoded_url).decode()
+            except (binascii.Error, UnicodeDecodeError) as e:
+                logger.warning("Failed to decode cover URL: %s", e)
+                return jsonify({"error": "Invalid cover URL encoding"}), 400
+
+            # Fetch and cache the original image
+            original = cache.fetch_and_cache(cover_id, original_url)
+            if not original:
+                return jsonify({"error": "Failed to fetch cover image"}), 404
+
+        image_data, content_type = original
+
+        if variant_cache_id:
+            variant = create_image_variant(
+                image_data,
+                width=width,
+                height=height,
+                image_format=image_format,
+            )
+            if variant:
+                image_data, content_type = variant
+                cache.put(variant_cache_id, image_data, content_type)
+
+        response = make_cover_response(image_data, content_type, cache_status="MISS")
     except _IMPORT_OPERATIONAL_ERRORS as e:
         logger.error_trace(f"Cover fetch error: {e}")
         return jsonify({"error": str(e)}), 500
diff --git a/src/frontend/src/components/BookTargetDropdown.tsx b/src/frontend/src/components/BookTargetDropdown.tsx
index e5f32ab8..64d7bd8b 100644
--- a/src/frontend/src/components/BookTargetDropdown.tsx
+++ b/src/frontend/src/components/BookTargetDropdown.tsx
@@ -296,6 +296,7 @@ const BookTargetDropdownSession = ({
       multiple
       showCheckboxes
       keepOpenOnSelect
+      positionStrategy={variant === 'icon' ? 'fixed' : 'absolute'}
       summaryFormatter={(selectedOptions) => renderSummary(selectedOptions)}
       renderTrigger={customTrigger}
       onOpenChange={onOpenChange}
diff --git a/src/frontend/src/components/ConfigSetupBanner.tsx b/src/frontend/src/components/ConfigSetupBanner.tsx
index 697c380f..523e2748 100644
--- a/src/frontend/src/components/ConfigSetupBanner.tsx
+++ b/src/frontend/src/components/ConfigSetupBanner.tsx
@@ -72,7 +72,7 @@ export const ConfigSetupBanner = ({
       {/* Backdrop */}
       <button
         type="button"
-        className={`absolute inset-0 bg-black/50 backdrop-blur-xs transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
+        className={`absolute inset-0 bg-black/60 transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
         onClick={handleClose}
         aria-label="Close settings setup dialog"
       />
diff --git a/src/frontend/src/components/DetailsModal.tsx b/src/frontend/src/components/DetailsModal.tsx
index ad5b4af2..305e9518 100644
--- a/src/frontend/src/components/DetailsModal.tsx
+++ b/src/frontend/src/components/DetailsModal.tsx
@@ -7,6 +7,7 @@ import { useMountEffect } from '../hooks/useMountEffect';
 import type { Book, ButtonStateInfo } from '../types';
 import { isMetadataBook } from '../types';
 import { bookSupportsTargets } from '../utils/bookTargetLoader';
+import { getSizedCoverUrl } from '../utils/covers';
 import { isUserCancelledError } from '../utils/errors';
 import { BookTargetDropdown } from './BookTargetDropdown';
 
@@ -136,6 +137,10 @@ export const DetailsModal = ({
   const artworkMaxWidth = isSquareCover
     ? 'min(45vw, 400px, calc(90vh - 220px))'
     : 'min(45vw, 520px, calc((90vh - 220px) / 1.6))';
+  const optimizedPreview = getSizedCoverUrl(book.preview, {
+    width: isSquareCover ? 640 : 480,
+    height: isSquareCover ? 640 : 720,
+  });
   const additionalInfo =
     book.info && Object.keys(book.info).length > 0
       ? Object.entries(book.info).filter(([key]) => {
@@ -201,14 +206,17 @@ export const DetailsModal = ({
           <div className="min-h-0 flex-1 overflow-y-auto px-5 py-6">
             <div className="flex flex-col gap-6 lg:min-h-0 lg:flex-row lg:items-stretch lg:gap-8">
               <div className="flex w-full justify-center lg:w-auto lg:flex-none lg:justify-start lg:self-stretch lg:pr-4">
-                {book.preview ? (
+                {optimizedPreview ? (
                   <div
                     className="flex w-full items-center justify-center lg:h-full lg:max-w-none"
                     style={{ maxHeight: artworkMaxHeight, maxWidth: artworkMaxWidth }}
                   >
                     <img
-                      src={book.preview}
+                      src={optimizedPreview}
                       alt="Book cover"
+                      width={isSquareCover ? 640 : 480}
+                      height={isSquareCover ? 640 : 720}
+                      decoding="async"
                       className="h-auto max-h-full w-auto max-w-full rounded-xl object-contain shadow-lg"
                       style={{ maxHeight: '100%', maxWidth: '100%' }}
                     />
diff --git a/src/frontend/src/components/Dropdown.tsx b/src/frontend/src/components/Dropdown.tsx
index ea0a4a26..4b11e3c9 100644
--- a/src/frontend/src/components/Dropdown.tsx
+++ b/src/frontend/src/components/Dropdown.tsx
@@ -4,30 +4,22 @@ import { createPortal } from 'react-dom';
 
 import { useDismiss } from '../hooks/useDismiss';
 
-// Simple throttle function to limit how often a function can be called
-function throttle<Args extends unknown[]>(
-  fn: (...args: Args) => void,
-  delay: number,
-): (...args: Args) => void {
-  let lastCall = 0;
-  let timeoutId: ReturnType<typeof setTimeout> | null = null;
-
-  return (...args: Args) => {
-    const now = Date.now();
-    const timeSinceLastCall = now - lastCall;
-
-    if (timeSinceLastCall >= delay) {
-      lastCall = now;
-      fn(...args);
-    } else if (!timeoutId) {
-      // Schedule a trailing call
-      timeoutId = setTimeout(() => {
-        lastCall = Date.now();
-        timeoutId = null;
-        fn(...args);
-      }, delay - timeSinceLastCall);
+const FIXED_DROPDOWN_Z_INDEX = 1050;
+const DROPDOWN_GAP_PX = 8;
+
+function getPositioningAncestor(element: HTMLElement | null): HTMLElement | null {
+  let current = element?.parentElement;
+
+  while (current) {
+    const style = getComputedStyle(current);
+    const overflowY = style.overflowY;
+    if (overflowY === 'auto' || overflowY === 'scroll' || overflowY === 'hidden') {
+      return current;
     }
-  };
+    current = current.parentElement;
+  }
+
+  return null;
 }
 
 interface DropdownProps {
@@ -43,6 +35,7 @@ interface DropdownProps {
   /** Disable max-height and overflow scrolling (for panels with nested dropdowns) */
   noScrollLimit?: boolean;
   triggerChrome?: 'default' | 'minimal';
+  positionStrategy?: 'absolute' | 'fixed';
   onOpenChange?: (isOpen: boolean) => void;
 }
 
@@ -58,6 +51,7 @@ export const Dropdown = ({
   renderTrigger,
   noScrollLimit = false,
   triggerChrome = 'default',
+  positionStrategy = 'absolute',
   onOpenChange,
 }: DropdownProps) => {
   const [isOpen, setIsOpen] = useState(false);
@@ -65,7 +59,9 @@ export const Dropdown = ({
   const triggerRef = useRef<HTMLDivElement>(null);
   const panelRef = useRef<HTMLDivElement>(null);
   const [panelDirection, setPanelDirection] = useState<'down' | 'up'>('down');
-  const [panelPos, setPanelPos] = useState({ top: 0, left: 0, width: 0 });
+  const [resolvedAlign, setResolvedAlign] = useState<'left' | 'right'>(
+    align === 'right' ? 'right' : 'left',
+  );
 
   let triggerBorderRadius = '0.5rem';
   if (triggerChrome === 'minimal') {
@@ -79,6 +75,13 @@ export const Dropdown = ({
     panelBorderRadius = panelDirection === 'down' ? '0 0 0.5rem 0.5rem' : '0.5rem 0.5rem 0 0';
   }
 
+  let panelOffsetClassName = 'top-full -mt-px';
+  if (panelDirection === 'down') {
+    panelOffsetClassName = renderTrigger ? 'top-full mt-2' : 'top-full -mt-px';
+  } else {
+    panelOffsetClassName = renderTrigger ? 'bottom-full mb-2' : 'bottom-full -mb-px';
+  }
+
   const toggleOpen = () => {
     if (disabled) return;
     setIsOpen((prev) => {
@@ -95,63 +98,143 @@ export const Dropdown = ({
 
   useDismiss(isOpen, [containerRef, panelRef], close);
 
-  // Compute panel direction and fixed position relative to the trigger
-  const updatePanelPosition = useCallback(() => {
+  const updatePanelLayout = useCallback(() => {
     if (!triggerRef.current || !panelRef.current) return;
 
     const rect = triggerRef.current.getBoundingClientRect();
-    const panelHeight = panelRef.current.offsetHeight || panelRef.current.scrollHeight;
-    const panelWidth = panelRef.current.offsetWidth || panelRef.current.scrollWidth;
+    const panelElement = panelRef.current;
+    const boundaryRect =
+      positionStrategy === 'absolute'
+        ? getPositioningAncestor(containerRef.current)?.getBoundingClientRect()
+        : undefined;
+
+    if (positionStrategy === 'fixed' && !panelClassName) {
+      panelElement.style.width = `${rect.width}px`;
+    } else {
+      panelElement.style.removeProperty('width');
+    }
+
+    const panelHeight = panelElement.offsetHeight || panelElement.scrollHeight;
+    const panelWidth = panelElement.offsetWidth || panelElement.scrollWidth;
+    const boundaryTop = boundaryRect?.top ?? 0;
+    const boundaryRight = boundaryRect?.right ?? window.innerWidth;
+    const boundaryBottom = boundaryRect?.bottom ?? window.innerHeight;
+    const boundaryLeft = boundaryRect?.left ?? 0;
 
     // Direction: flip up if not enough space below but enough above
-    const spaceBelow = window.innerHeight - rect.bottom - 8;
-    const spaceAbove = rect.top - 8;
+    const spaceBelow = boundaryBottom - rect.bottom - DROPDOWN_GAP_PX;
+    const spaceAbove = rect.top - boundaryTop - DROPDOWN_GAP_PX;
     const shouldOpenUp = spaceBelow < panelHeight && spaceAbove >= panelHeight;
-    setPanelDirection(shouldOpenUp ? 'up' : 'down');
+    const nextDirection = shouldOpenUp ? 'up' : 'down';
+    setPanelDirection((current) => (current === nextDirection ? current : nextDirection));
+
+    let nextAlign: 'left' | 'right';
+    if (align === 'auto') {
+      const overflowsRight = rect.left + panelWidth > boundaryRight - DROPDOWN_GAP_PX;
+      const overflowsLeft = rect.right - panelWidth < boundaryLeft + DROPDOWN_GAP_PX;
+      nextAlign = overflowsRight && !overflowsLeft ? 'right' : 'left';
+    } else {
+      nextAlign = align === 'right' ? 'right' : 'left';
+    }
+    setResolvedAlign((current) => (current === nextAlign ? current : nextAlign));
+
+    if (positionStrategy !== 'fixed') {
+      panelElement.style.removeProperty('top');
+      panelElement.style.removeProperty('left');
+      return;
+    }
 
-    // Vertical: seamless trigger uses -1px border overlap, custom trigger uses 8px gap
+    // Fixed-position panels need explicit viewport coordinates.
     let top: number;
     if (shouldOpenUp) {
-      top = renderTrigger ? rect.top - panelHeight - 8 : rect.top - panelHeight + 1;
+      top = renderTrigger ? rect.top - panelHeight - DROPDOWN_GAP_PX : rect.top - panelHeight + 1;
     } else {
-      top = renderTrigger ? rect.bottom + 8 : rect.bottom - 1;
+      top = renderTrigger ? rect.bottom + DROPDOWN_GAP_PX : rect.bottom - 1;
     }
 
-    // Horizontal alignment
     let left: number;
-    if (align === 'auto') {
-      const overflowsRight = rect.left + panelWidth > window.innerWidth - 8;
-      const overflowsLeft = rect.right - panelWidth < 8;
-      left =
-        overflowsRight && !overflowsLeft
-          ? rect.right - Math.max(panelWidth, rect.width)
-          : rect.left;
-    } else if (align === 'right') {
+    if (nextAlign === 'right') {
       left = rect.right - Math.max(panelWidth, rect.width);
     } else {
       left = rect.left;
     }
 
-    setPanelPos({ top, left, width: rect.width });
-  }, [align, renderTrigger]);
+    panelElement.style.top = `${top}px`;
+    panelElement.style.left = `${left}px`;
+  }, [align, panelClassName, positionStrategy, renderTrigger]);
 
   useLayoutEffect(() => {
     if (!isOpen) {
       return undefined;
     }
 
-    // Throttle scroll/resize handlers to reduce layout thrashing
-    const throttledUpdate = throttle(updatePanelPosition, 100);
+    updatePanelLayout();
+    window.addEventListener('resize', updatePanelLayout);
+    window.addEventListener('scroll', updatePanelLayout, true);
 
-    updatePanelPosition();
-    window.addEventListener('resize', throttledUpdate);
-    window.addEventListener('scroll', throttledUpdate, true);
+    const resizeObserver =
+      typeof ResizeObserver === 'undefined'
+        ? null
+        : new ResizeObserver(() => {
+            updatePanelLayout();
+          });
+    if (resizeObserver) {
+      if (triggerRef.current) {
+        resizeObserver.observe(triggerRef.current);
+      }
+      if (panelRef.current) {
+        resizeObserver.observe(panelRef.current);
+      }
+    }
 
     return () => {
-      window.removeEventListener('resize', throttledUpdate);
-      window.removeEventListener('scroll', throttledUpdate, true);
+      resizeObserver?.disconnect();
+      window.removeEventListener('resize', updatePanelLayout);
+      window.removeEventListener('scroll', updatePanelLayout, true);
     };
-  }, [isOpen, updatePanelPosition]);
+  }, [isOpen, updatePanelLayout]);
+
+  const panelChromeClassName = `border ${panelDirection === 'down' ? 'shadow-lg' : ''}`;
+  const panelContent = (
+    <div className={noScrollLimit ? '' : 'max-h-64 overflow-auto'}>{children({ close })}</div>
+  );
+
+  const absolutePanel =
+    isOpen && positionStrategy === 'absolute' ? (
+      <div
+        ref={panelRef}
+        className={`absolute ${resolvedAlign === 'right' ? 'right-0' : 'left-0'} ${panelOffsetClassName} z-50 ${panelChromeClassName} ${panelClassName || widthClassName}`}
+        style={{
+          background: 'var(--bg)',
+          borderColor: 'var(--border-muted)',
+          borderRadius: panelBorderRadius,
+        }}
+      >
+        {panelContent}
+      </div>
+    ) : null;
+
+  const fixedPanel =
+    isOpen && positionStrategy === 'fixed' && typeof document !== 'undefined'
+      ? createPortal(
+          <div
+            ref={panelRef}
+            className={`${panelChromeClassName} ${panelClassName ?? ''}`}
+            style={{
+              position: 'fixed',
+              top: 0,
+              left: 0,
+              zIndex: FIXED_DROPDOWN_Z_INDEX,
+              background: 'var(--bg)',
+              borderColor: 'var(--border-muted)',
+              borderRadius: panelBorderRadius,
+            }}
+          >
+            {panelContent}
+          </div>,
+          document.body,
+        )
+      : null;
 
   return (
     <div className={widthClassName} ref={containerRef}>
@@ -163,7 +246,7 @@ export const Dropdown = ({
           {label}
         </label>
       )}
-      <div ref={triggerRef}>
+      <div ref={triggerRef} className="relative">
         {renderTrigger ? (
           renderTrigger({ isOpen, toggle: toggleOpen })
         ) : (
@@ -193,29 +276,8 @@ export const Dropdown = ({
             </svg>
           </button>
         )}
-
-        {isOpen &&
-          createPortal(
-            <div
-              ref={panelRef}
-              className={`border ${panelDirection === 'down' ? 'shadow-lg' : ''} ${panelClassName ?? ''}`}
-              style={{
-                position: 'fixed',
-                top: panelPos.top,
-                left: panelPos.left,
-                width: panelClassName ? undefined : panelPos.width,
-                zIndex: 100,
-                background: 'var(--bg)',
-                borderColor: 'var(--border-muted)',
-                borderRadius: panelBorderRadius,
-              }}
-            >
-              <div className={noScrollLimit ? '' : 'max-h-64 overflow-auto'}>
-                {children({ close })}
-              </div>
-            </div>,
-            document.body,
-          )}
+        {absolutePanel}
+        {fixedPanel}
       </div>
     </div>
   );
diff --git a/src/frontend/src/components/DropdownList.tsx b/src/frontend/src/components/DropdownList.tsx
index a23f396b..981484d8 100644
--- a/src/frontend/src/components/DropdownList.tsx
+++ b/src/frontend/src/components/DropdownList.tsx
@@ -26,6 +26,7 @@ interface DropdownListProps {
   summaryFormatter?: (selected: DropdownListOption[], placeholder: string) => ReactNode;
   keepOpenOnSelect?: boolean;
   triggerChrome?: 'default' | 'minimal';
+  positionStrategy?: 'absolute' | 'fixed';
   renderTrigger?: (props: { isOpen: boolean; toggle: () => void }) => ReactNode;
   onOpenChange?: (isOpen: boolean) => void;
 }
@@ -45,6 +46,7 @@ export const DropdownList = ({
   summaryFormatter,
   keepOpenOnSelect,
   triggerChrome = 'default',
+  positionStrategy,
   renderTrigger,
   onOpenChange,
 }: DropdownListProps) => {
@@ -114,6 +116,7 @@ export const DropdownList = ({
       buttonClassName={buttonClassName}
       panelClassName={panelClassName}
       triggerChrome={triggerChrome}
+      positionStrategy={positionStrategy}
       renderTrigger={renderTrigger}
       onOpenChange={onOpenChange}
     >
diff --git a/src/frontend/src/components/Header.tsx b/src/frontend/src/components/Header.tsx
index 1ce7b101..9db3e4c6 100644
--- a/src/frontend/src/components/Header.tsx
+++ b/src/frontend/src/components/Header.tsx
@@ -646,7 +646,7 @@ export const Header = forwardRef<HeaderHandle, HeaderProps>(
 
     return (
       <header
-        className="sticky top-0 z-40 w-full backdrop-blur-xs"
+        className="sticky top-0 z-40 w-full"
         style={{ background: 'var(--bg)', paddingTop: 'env(safe-area-inset-top)' }}
       >
         <div className="mx-auto max-w-full px-4 py-4 sm:px-6 lg:px-8">
diff --git a/src/frontend/src/components/OnBehalfConfirmationModal.tsx b/src/frontend/src/components/OnBehalfConfirmationModal.tsx
index aedc4ecd..8cd8af2b 100644
--- a/src/frontend/src/components/OnBehalfConfirmationModal.tsx
+++ b/src/frontend/src/components/OnBehalfConfirmationModal.tsx
@@ -61,7 +61,7 @@ export const OnBehalfConfirmationModal = ({
     <div className="fixed inset-0 z-50 flex items-center justify-center p-4">
       <button
         type="button"
-        className={`absolute inset-0 bg-black/50 backdrop-blur-xs transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
+        className={`absolute inset-0 bg-black/60 transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
         onClick={handleClose}
         tabIndex={-1}
         aria-label="Close download confirmation"
diff --git a/src/frontend/src/components/OnboardingModal.tsx b/src/frontend/src/components/OnboardingModal.tsx
index eacb0333..7813d09f 100644
--- a/src/frontend/src/components/OnboardingModal.tsx
+++ b/src/frontend/src/components/OnboardingModal.tsx
@@ -339,7 +339,7 @@ const OnboardingModalSession = ({
   if (isLoading) {
     return (
       <div className="fixed inset-0 z-50 flex items-center justify-center">
-        <div className="absolute inset-0 bg-black/50 backdrop-blur-xs" />
+        <div className="absolute inset-0 bg-black/60" />
         <div className="relative rounded-xl p-8 shadow-2xl" style={{ background: 'var(--bg)' }}>
           <div className="flex items-center gap-3">
             <svg className="h-5 w-5 animate-spin" viewBox="0 0 24 24">
@@ -371,7 +371,7 @@ const OnboardingModalSession = ({
       <div className="fixed inset-0 z-50 flex items-center justify-center">
         <button
           type="button"
-          className="absolute inset-0 bg-black/50 backdrop-blur-xs"
+          className="absolute inset-0 bg-black/60"
           onClick={handleClose}
           tabIndex={-1}
           aria-label="Close setup wizard"
@@ -419,7 +419,7 @@ const OnboardingModalSession = ({
     <div className="fixed inset-0 z-50 flex items-center justify-center p-4">
       {/* Backdrop */}
       <div
-        className={`absolute inset-0 bg-black/50 backdrop-blur-xs transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
+        className={`absolute inset-0 bg-black/60 transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
       />
 
       {/* Modal */}
diff --git a/src/frontend/src/components/ReleaseModal.tsx b/src/frontend/src/components/ReleaseModal.tsx
index fa79b0f3..2fa4a0ca 100644
--- a/src/frontend/src/components/ReleaseModal.tsx
+++ b/src/frontend/src/components/ReleaseModal.tsx
@@ -22,6 +22,7 @@ import type {
 import { isMetadataBook } from '../types';
 import { bookSupportsTargets } from '../utils/bookTargetLoader';
 import { getColorStyleFromHint } from '../utils/colorMaps';
+import { getSizedCoverUrl } from '../utils/covers';
 import {
   LANGUAGE_OPTION_DEFAULT,
   getLanguageFilterValues,
@@ -190,8 +191,9 @@ function StarRating({ rating, maxRating = 5 }: { rating: number; maxRating?: num
 const ReleaseThumbnail = ({ preview, title }: { preview?: string; title?: string }) => {
   const [imageLoaded, setImageLoaded] = useState(false);
   const [imageError, setImageError] = useState(false);
+  const optimizedPreview = getSizedCoverUrl(preview, { width: 32, height: 48 });
 
-  if (!preview || imageError) {
+  if (!optimizedPreview || imageError) {
     return (
       <div
         className="flex h-10 w-7 shrink-0 items-center justify-center rounded-sm bg-zinc-200 text-[7px] font-medium text-zinc-500 sm:h-12 sm:w-8 sm:text-[8px] dark:bg-zinc-700 dark:text-zinc-400"
@@ -208,10 +210,13 @@ const ReleaseThumbnail = ({ preview, title }: { preview?: string; title?: string
         <div className="absolute inset-0 animate-pulse bg-linear-to-r from-gray-200 via-gray-100 to-gray-200 dark:from-gray-700 dark:via-gray-600 dark:to-gray-700" />
       )}
       <img
-        src={preview}
+        src={optimizedPreview}
         alt={title || 'Book cover'}
         className="h-full w-full object-cover object-top"
         loading="lazy"
+        decoding="async"
+        width={32}
+        height={48}
         onLoad={() => setImageLoaded(true)}
         onError={() => setImageError(true)}
         style={{ opacity: imageLoaded ? 1 : 0, transition: 'opacity 0.2s ease-in-out' }}
@@ -392,7 +397,7 @@ const ReleaseRow = ({
 
   return (
     <div
-      className={`hover-row animate-pop-up py-2 pr-4 pl-5 transition-colors duration-200 will-change-transform sm:pr-5 ${
+      className={`hover-row animate-pop-up py-2 pr-4 pl-5 transition-colors duration-200 sm:pr-5 ${
         selectionMode ? 'cursor-pointer' : ''
       } ${isSelected ? 'bg-emerald-50/50 dark:bg-emerald-900/10' : ''}`}
       style={{
@@ -1173,6 +1178,10 @@ const ReleaseModalSession = ({
   } else if (book.series_name) {
     coverSizeClassName = 'h-[144px] w-24';
   }
+  const modalPreview = getSizedCoverUrl(book.preview, {
+    width: book.cover_aspect === 'square' ? 144 : 96,
+    height: 144,
+  });
 
   let combinedFooterEbookMode = combinedEbookMode;
   if (combinedPhase === 'ebook') {
@@ -1212,13 +1221,14 @@ const ReleaseModalSession = ({
             {/* Mobile: static thumbnail always visible */}
             {!isRequestMode && (
               <div className="shrink-0 sm:hidden">
-                {book.preview ? (
+                {modalPreview ? (
                   <img
-                    src={book.preview}
+                    src={modalPreview}
                     alt=""
                     width={book.cover_aspect === 'square' ? 68 : 46}
                     height={68}
                     className={`rounded-sm object-cover shadow-md ${book.cover_aspect === 'square' ? 'object-center' : 'object-top'}`}
+                    decoding="async"
                     style={{
                       width: book.cover_aspect === 'square' ? 68 : 46,
                       height: 68,
@@ -1252,13 +1262,14 @@ const ReleaseModalSession = ({
                   className="transition-opacity duration-300 ease-out"
                   style={{ opacity: showHeaderThumb ? 1 : 0 }}
                 >
-                  {book.preview ? (
+                  {modalPreview ? (
                     <img
-                      src={book.preview}
+                      src={modalPreview}
                       alt=""
                       width={book.cover_aspect === 'square' ? 68 : 46}
                       height={68}
                       className={`rounded-sm object-cover shadow-md ${book.cover_aspect === 'square' ? 'object-center' : 'object-top'}`}
+                      decoding="async"
                       style={{
                         width: book.cover_aspect === 'square' ? 68 : 46,
                         height: 68,
@@ -1321,10 +1332,13 @@ const ReleaseModalSession = ({
                 ref={bookSummaryRef}
                 className="flex gap-4 border-b border-(--border-muted) px-5 py-4"
               >
-                {book.preview ? (
+                {modalPreview ? (
                   <img
-                    src={book.preview}
+                    src={modalPreview}
                     alt="Book cover"
+                    width={book.cover_aspect === 'square' ? (book.series_name ? 144 : 120) : 96}
+                    height={book.series_name ? 144 : 120}
+                    decoding="async"
                     className={`hidden shrink-0 rounded-lg object-cover shadow-md sm:block ${coverAspectClassName} ${coverSizeClassName}`}
                   />
                 ) : (
@@ -2090,7 +2104,7 @@ const ReleaseModalSession = ({
                               '',
                           ))) && (
                         <div
-                          className="animate-pop-up py-3 text-center will-change-transform"
+                          className="animate-pop-up py-3 text-center"
                           style={{
                             animationDelay: `${filteredReleases.length * 30}ms`,
                             animationFillMode: 'both',
diff --git a/src/frontend/src/components/RequestConfirmationModal.tsx b/src/frontend/src/components/RequestConfirmationModal.tsx
index ffe41d2c..afb8576c 100644
--- a/src/frontend/src/components/RequestConfirmationModal.tsx
+++ b/src/frontend/src/components/RequestConfirmationModal.tsx
@@ -5,6 +5,7 @@ import { useEscapeKey } from '../hooks/useEscapeKey';
 import { useMountEffect } from '../hooks/useMountEffect';
 import { getMetadataBookInfo } from '../services/api';
 import type { CreateRequestPayload } from '../types';
+import { getSizedCoverUrl } from '../utils/covers';
 import type { RequestConfirmationPreview } from '../utils/requestConfirmation';
 import {
   applyRequestNoteToPayload,
@@ -175,6 +176,7 @@ function RequestConfirmationModalSession({
 
   const titleId = 'request-confirmation-modal-title';
   const confirmDisabled = isSubmitting || (allowNotes && note.length > MAX_REQUEST_NOTE_LENGTH);
+  const previewImage = getSizedCoverUrl(preview.preview, { width: 64, height: 96 });
 
   const submit = async () => {
     if (confirmDisabled) {
@@ -200,7 +202,7 @@ function RequestConfirmationModalSession({
     <div className="fixed inset-0 z-50 flex items-center justify-center p-4">
       <button
         type="button"
-        className={`absolute inset-0 bg-black/50 backdrop-blur-xs transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
+        className={`absolute inset-0 bg-black/60 transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
         onClick={handleClose}
         tabIndex={-1}
         aria-label="Close request confirmation"
@@ -240,11 +242,15 @@ function RequestConfirmationModalSession({
           <div className="rounded-xl border border-(--border-muted) bg-(--bg-soft) px-4 py-4">
             <div className="flex gap-4">
               <div className="h-24 w-16 shrink-0 overflow-hidden rounded-lg border border-(--border-muted) bg-(--bg)">
-                {preview.preview ? (
+                {previewImage ? (
                   <img
-                    src={preview.preview}
+                    src={previewImage}
                     alt={`${preview.title} cover`}
                     className="h-full w-full object-cover object-top"
+                    loading="lazy"
+                    decoding="async"
+                    width={64}
+                    height={96}
                   />
                 ) : (
                   <div className="flex h-full w-full items-center justify-center text-[10px] opacity-60">
diff --git a/src/frontend/src/components/activity/ActivityCard.tsx b/src/frontend/src/components/activity/ActivityCard.tsx
index 98fb3287..c90ea1c5 100644
--- a/src/frontend/src/components/activity/ActivityCard.tsx
+++ b/src/frontend/src/components/activity/ActivityCard.tsx
@@ -3,6 +3,7 @@ import { useLayoutEffect, useMemo, useRef, useState } from 'react';
 
 import type { RequestRecord } from '../../types';
 import { withBasePath } from '../../utils/basePath';
+import { getSizedCoverUrl } from '../../utils/covers';
 import { Tooltip } from '../shared/Tooltip';
 import type { ActivityCardAction } from './activityCardModel';
 import { buildActivityCardModel } from './activityCardModel';
@@ -499,6 +500,7 @@ export const ActivityCard = ({
   const titleLineRef = useRef<HTMLParagraphElement | null>(null);
   const [badgeOverflow, setBadgeOverflow] = useState<Record<string, boolean>>({});
   const [titleOverflow, setTitleOverflow] = useState(false);
+  const previewImage = getSizedCoverUrl(item.preview, { width: 48, height: 72 });
 
   useLayoutEffect(() => {
     const measureBadgeOverflow = () => {
@@ -709,11 +711,15 @@ export const ActivityCard = ({
       <div className="flex items-start gap-3">
         {/* Artwork */}
         <div className="h-18 w-12 shrink-0 overflow-hidden rounded-sm bg-gray-200 dark:bg-gray-700">
-          {item.preview ? (
+          {previewImage ? (
             <img
-              src={item.preview}
+              src={previewImage}
               alt={`${item.title} cover`}
               className="h-full w-full object-cover object-top"
+              loading="lazy"
+              decoding="async"
+              width={48}
+              height={72}
             />
           ) : (
             <BookFallback />
diff --git a/src/frontend/src/components/resultsViews/CardView.tsx b/src/frontend/src/components/resultsViews/CardView.tsx
index fddcabcf..67311393 100644
--- a/src/frontend/src/components/resultsViews/CardView.tsx
+++ b/src/frontend/src/components/resultsViews/CardView.tsx
@@ -3,6 +3,7 @@ import { useState } from 'react';
 import { useSearchMode } from '../../contexts/SearchModeContext';
 import type { Book, ButtonStateInfo } from '../../types';
 import { bookSupportsTargets } from '../../utils/bookTargetLoader';
+import { getSizedCoverUrl } from '../../utils/covers';
 import { BookActionButton } from '../BookActionButton';
 import { BookTargetDropdown } from '../BookTargetDropdown';
 import { DisplayFieldBadges } from '../shared';
@@ -41,6 +42,11 @@ export const CardView = ({
   const [dropdownOpen, setDropdownOpen] = useState(false);
   const targetProvider = book.provider;
   const targetBookId = book.provider_id;
+  const isSquareCover = book.cover_aspect === 'square';
+  const optimizedPreview = getSizedCoverUrl(book.preview, {
+    width: 292,
+    height: isSquareCover ? 292 : 438,
+  });
   let zIndex: number | undefined;
   if (dropdownOpen) {
     zIndex = 20;
@@ -68,7 +74,7 @@ export const CardView = ({
 
   return (
     <article
-      className="book-card space-between animate-pop-up relative flex h-full w-full flex-col transition-shadow duration-300 will-change-transform max-sm:h-[180px] max-sm:flex-row sm:max-w-[292px] sm:flex-col"
+      className="book-card space-between animate-pop-up relative flex h-full w-full flex-col transition-shadow duration-300 max-sm:h-[180px] max-sm:flex-row sm:max-w-[292px] sm:flex-col"
       style={{
         background: 'var(--bg-soft)',
         borderRadius: '.75rem',
@@ -97,7 +103,7 @@ export const CardView = ({
               #{book.series_position}
             </div>
           )}
-          {book.preview && !imageError ? (
+          {optimizedPreview && !imageError ? (
             <>
               {!imageLoaded && (
                 <div className="absolute inset-0">
@@ -105,9 +111,13 @@ export const CardView = ({
                 </div>
               )}
               <img
-                src={book.preview}
+                src={optimizedPreview}
                 alt={book.title || 'Book cover'}
                 className="h-full w-full"
+                loading="lazy"
+                decoding="async"
+                width={292}
+                height={isSquareCover ? 292 : 438}
                 style={{
                   opacity: imageLoaded ? 1 : 0,
                   transition: 'opacity 0.3s ease-in-out',
@@ -146,13 +156,13 @@ export const CardView = ({
               bookId={targetBookId}
               onShowToast={onShowToast}
               variant="icon"
-              className="h-8 w-8 bg-white/90 shadow-lg backdrop-blur-xs hover:scale-110 dark:bg-neutral-800/90"
+              className="h-8 w-8 bg-white/95 shadow-lg hover:scale-110 dark:bg-neutral-800/95"
               onOpenChange={setDropdownOpen}
             />
           )}
           <button
             type="button"
-            className="flex h-8 w-8 items-center justify-center rounded-full bg-white/90 shadow-lg backdrop-blur-xs transition-all duration-300 hover:scale-110 dark:bg-neutral-800/90"
+            className="flex h-8 w-8 items-center justify-center rounded-full bg-white/95 shadow-lg transition-all duration-300 hover:scale-110 dark:bg-neutral-800/95"
             onClick={(e) => {
               e.stopPropagation();
               void handleDetails(book.id);
diff --git a/src/frontend/src/components/resultsViews/CompactView.tsx b/src/frontend/src/components/resultsViews/CompactView.tsx
index 4ecdd8b7..6cb4de9f 100644
--- a/src/frontend/src/components/resultsViews/CompactView.tsx
+++ b/src/frontend/src/components/resultsViews/CompactView.tsx
@@ -3,6 +3,7 @@ import { useState } from 'react';
 import { useSearchMode } from '../../contexts/SearchModeContext';
 import type { Book, ButtonStateInfo } from '../../types';
 import { bookSupportsTargets } from '../../utils/bookTargetLoader';
+import { getSizedCoverUrl } from '../../utils/covers';
 import { BookActionButton } from '../BookActionButton';
 import { BookTargetDropdown } from '../BookTargetDropdown';
 import { DisplayFieldBadges, DisplayFieldIcon } from '../shared';
@@ -44,6 +45,11 @@ export const CompactView = ({
   const targetProvider = book.provider;
   const targetBookId = book.provider_id;
   const microphoneField = book.display_fields?.find((field) => field.icon === 'microphone');
+  const isSquareCover = book.cover_aspect === 'square';
+  const optimizedPreview = getSizedCoverUrl(book.preview, {
+    width: 120,
+    height: isSquareCover ? 120 : 180,
+  });
   let zIndex: number | undefined;
   if (dropdownOpen) {
     zIndex = 20;
@@ -71,7 +77,7 @@ export const CompactView = ({
 
   return (
     <article
-      className="book-card animate-pop-up relative flex! h-[180px]! w-full flex-row! transition-shadow duration-300 will-change-transform"
+      className="book-card animate-pop-up relative flex! h-[180px]! w-full flex-row! transition-shadow duration-300"
       style={{
         background: 'var(--bg-soft)',
         borderRadius: '.75rem',
@@ -97,7 +103,7 @@ export const CompactView = ({
               #{book.series_position}
             </div>
           )}
-          {book.preview && !imageError ? (
+          {optimizedPreview && !imageError ? (
             <>
               {!imageLoaded && (
                 <div className="absolute inset-0">
@@ -105,9 +111,13 @@ export const CompactView = ({
                 </div>
               )}
               <img
-                src={book.preview}
+                src={optimizedPreview}
                 alt={book.title || 'Book cover'}
                 className="h-full w-full"
+                loading="lazy"
+                decoding="async"
+                width={120}
+                height={isSquareCover ? 120 : 180}
                 style={{
                   opacity: imageLoaded ? 1 : 0,
                   transition: 'opacity 0.3s ease-in-out',
@@ -147,13 +157,13 @@ export const CompactView = ({
                 bookId={targetBookId}
                 onShowToast={onShowToast}
                 variant="icon"
-                className="h-8 w-8 bg-white/90 shadow-lg backdrop-blur-xs hover:scale-110 dark:bg-neutral-800/90"
+                className="h-8 w-8 bg-white/95 shadow-lg hover:scale-110 dark:bg-neutral-800/95"
                 onOpenChange={setDropdownOpen}
               />
             )}
             <button
               type="button"
-              className="flex h-8 w-8 items-center justify-center rounded-full bg-white/90 shadow-lg backdrop-blur-xs transition-all duration-300 hover:scale-110 dark:bg-neutral-800/90"
+              className="flex h-8 w-8 items-center justify-center rounded-full bg-white/95 shadow-lg transition-all duration-300 hover:scale-110 dark:bg-neutral-800/95"
               onClick={(e) => {
                 e.stopPropagation();
                 void handleDetails(book.id);
diff --git a/src/frontend/src/components/resultsViews/ListView.tsx b/src/frontend/src/components/resultsViews/ListView.tsx
index 0fe46f0b..52f481bd 100644
--- a/src/frontend/src/components/resultsViews/ListView.tsx
+++ b/src/frontend/src/components/resultsViews/ListView.tsx
@@ -4,6 +4,7 @@ import { useSearchMode } from '../../contexts/SearchModeContext';
 import type { Book, ButtonStateInfo, DisplayField } from '../../types';
 import { bookSupportsTargets } from '../../utils/bookTargetLoader';
 import { getFormatColor, getLanguageColor } from '../../utils/colorMaps';
+import { getSizedCoverUrl } from '../../utils/covers';
 import { BookActionButton } from '../BookActionButton';
 import { BookTargetDropdown } from '../BookTargetDropdown';
 import { DisplayFieldIcon, DisplayFieldBadge } from '../shared';
@@ -47,8 +48,12 @@ const ListViewThumbnail = ({
   const [imageError, setImageError] = useState(false);
   const isSquare = coverAspect === 'square';
   const sizeClass = isSquare ? 'w-10 h-10 sm:w-14 sm:h-14' : 'w-7 h-10 sm:w-10 sm:h-14';
+  const optimizedPreview = getSizedCoverUrl(preview, {
+    width: isSquare ? 56 : 40,
+    height: isSquare ? 56 : 56,
+  });
 
-  if (!preview || imageError) {
+  if (!optimizedPreview || imageError) {
     return (
       <div
         className={`${sizeClass} flex items-center justify-center rounded-sm bg-gray-200 text-[8px] font-medium text-gray-500 sm:text-[9px] dark:bg-gray-700 dark:text-gray-300`}
@@ -67,10 +72,13 @@ const ListViewThumbnail = ({
         <div className="absolute inset-0 animate-pulse bg-linear-to-r from-gray-200 via-gray-100 to-gray-200 dark:from-gray-700 dark:via-gray-600 dark:to-gray-700" />
       )}
       <img
-        src={preview}
+        src={optimizedPreview}
         alt={title || 'Book cover'}
         className={`h-full w-full object-cover ${isSquare ? 'object-center' : 'object-top'}`}
         loading="lazy"
+        decoding="async"
+        width={isSquare ? 56 : 40}
+        height={isSquare ? 56 : 56}
         onLoad={() => setImageLoaded(true)}
         onError={() => setImageError(true)}
         style={{ opacity: imageLoaded ? 1 : 0, transition: 'opacity 0.2s ease-in-out' }}
@@ -153,7 +161,7 @@ export const ListView = ({
           return (
             <div
               key={book.id}
-              className="hover-row animate-pop-up relative w-full px-1.5 py-1.5 transition-colors duration-200 will-change-transform sm:px-2 sm:py-2"
+              className="hover-row animate-pop-up relative w-full px-1.5 py-1.5 transition-colors duration-200 sm:px-2 sm:py-2"
               style={{
                 zIndex: openDropdownBookId === book.id ? 30 : undefined,
                 animationDelay: `${index * 50}ms`,
diff --git a/src/frontend/src/components/settings/SelfSettingsModal.tsx b/src/frontend/src/components/settings/SelfSettingsModal.tsx
index 95d7375b..c7ec09aa 100644
--- a/src/frontend/src/components/settings/SelfSettingsModal.tsx
+++ b/src/frontend/src/components/settings/SelfSettingsModal.tsx
@@ -265,7 +265,7 @@ const SelfSettingsModalSession = ({
     <div className="fixed inset-0 z-50 flex items-center justify-center p-4">
       <button
         type="button"
-        className={`absolute inset-0 bg-black/50 backdrop-blur-xs transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
+        className={`absolute inset-0 bg-black/60 transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
         onClick={handleClose}
         tabIndex={-1}
         aria-label="Close account settings"
diff --git a/src/frontend/src/components/settings/SettingsModal.tsx b/src/frontend/src/components/settings/SettingsModal.tsx
index a8c8c357..d2c77e1a 100644
--- a/src/frontend/src/components/settings/SettingsModal.tsx
+++ b/src/frontend/src/components/settings/SettingsModal.tsx
@@ -388,7 +388,7 @@ const SettingsModalSession = ({
         {tabSync}
         <button
           type="button"
-          className="absolute inset-0 bg-black/50 backdrop-blur-[2px]"
+          className="absolute inset-0 bg-black/60"
           style={{ willChange: 'opacity', contain: 'strict' }}
           onClick={handleClose}
           tabIndex={-1}
@@ -428,7 +428,7 @@ const SettingsModalSession = ({
         {tabSync}
         <button
           type="button"
-          className="absolute inset-0 bg-black/50 backdrop-blur-[2px]"
+          className="absolute inset-0 bg-black/60"
           style={{ willChange: 'opacity', contain: 'strict' }}
           onClick={handleClose}
           tabIndex={-1}
@@ -509,7 +509,7 @@ const SettingsModalSession = ({
       {tabSync}
       <button
         type="button"
-        className={`absolute inset-0 bg-black/50 backdrop-blur-[2px] transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
+        className={`absolute inset-0 bg-black/60 transition-opacity duration-150 ${isClosing ? 'opacity-0' : 'opacity-100'}`}
         style={{ willChange: 'opacity', contain: 'strict' }}
         onClick={handleClose}
         tabIndex={-1}
diff --git a/src/frontend/src/styles.css b/src/frontend/src/styles.css
index 945f79c6..493dccd2 100644
--- a/src/frontend/src/styles.css
+++ b/src/frontend/src/styles.css
@@ -360,7 +360,6 @@
     backface-visibility: hidden;
     -webkit-transform: translateZ(0);
     transform: translateZ(0);
-    will-change: transform, opacity;
   }
 
   .animate-pop-up {
@@ -369,7 +368,6 @@
     backface-visibility: hidden;
     -webkit-transform: translateZ(0);
     transform: translateZ(0);
-    will-change: transform, opacity;
   }
 
   .animate-fade-in-down {
@@ -378,7 +376,6 @@
     backface-visibility: hidden;
     -webkit-transform: translateZ(0);
     transform: translateZ(0);
-    will-change: transform, opacity;
   }
 
   .animate-fade-out-up {
@@ -387,7 +384,6 @@
     backface-visibility: hidden;
     -webkit-transform: translateZ(0);
     transform: translateZ(0);
-    will-change: transform, opacity;
   }
 
   /* Button spinner styles */
@@ -427,13 +423,11 @@
     inset: 0;
     width: 100%;
     height: 100%;
-    background: var(--loading-overlay);
+    background: rgba(0, 0, 0, 0.6);
     z-index: 1000;
     padding: 1.5rem;
     justify-content: center;
     align-items: center;
-    backdrop-filter: blur(6px);
-    -webkit-backdrop-filter: blur(6px);
   }
 
   .modal-overlay.active {
@@ -586,7 +580,6 @@
     backface-visibility: hidden;
     -webkit-transform: translateZ(0);
     transform: translateZ(0);
-    will-change: transform, opacity;
   }
 
   .settings-modal-exit {
@@ -595,17 +588,14 @@
     backface-visibility: hidden;
     -webkit-transform: translateZ(0);
     transform: translateZ(0);
-    will-change: transform, opacity;
   }
 
   .animate-fade-in {
     animation: fade-in 0.2s ease-out;
-    will-change: opacity;
   }
 
   .animate-fade-out {
     animation: fade-out 0.15s ease-in;
-    will-change: opacity;
   }
 
   /* ============================================
diff --git a/src/frontend/src/tests/covers.test.ts b/src/frontend/src/tests/covers.test.ts
new file mode 100644
index 00000000..a67cfd64
--- /dev/null
+++ b/src/frontend/src/tests/covers.test.ts
@@ -0,0 +1,33 @@
+import { describe, expect, it } from 'vitest';
+
+import { getSizedCoverUrl } from '../utils/covers';
+
+describe('getSizedCoverUrl', () => {
+  it('adds size and format params to local cover proxy URLs', () => {
+    expect(
+      getSizedCoverUrl('/api/covers/book-1?url=abc', {
+        width: 120,
+        height: 180,
+      }),
+    ).toBe('/api/covers/book-1?url=abc&w=120&h=180&format=webp');
+  });
+
+  it('leaves external preview URLs alone', () => {
+    expect(
+      getSizedCoverUrl('https://covers.example.com/book.jpg', {
+        width: 120,
+        height: 180,
+      }),
+    ).toBe('https://covers.example.com/book.jpg');
+  });
+
+  it('preserves absolute proxy URLs', () => {
+    expect(
+      getSizedCoverUrl('https://bookrequest.example.com/api/covers/book-1?url=abc', {
+        width: 56,
+        height: 56,
+        format: 'png',
+      }),
+    ).toBe('https://bookrequest.example.com/api/covers/book-1?url=abc&w=56&h=56&format=png');
+  });
+});
diff --git a/src/frontend/src/utils/covers.ts b/src/frontend/src/utils/covers.ts
new file mode 100644
index 00000000..f2438e13
--- /dev/null
+++ b/src/frontend/src/utils/covers.ts
@@ -0,0 +1,66 @@
+const COVER_PROXY_PATH = '/api/covers/';
+const LOCAL_URL_BASE = 'http://shelfmark.local';
+const DEFAULT_COVER_FORMAT = 'webp';
+const MAX_COVER_DIMENSION = 1024;
+
+type CoverFormat = 'jpeg' | 'png' | 'webp';
+
+interface SizedCoverUrlOptions {
+  width?: number;
+  height?: number;
+  format?: CoverFormat;
+}
+
+const normalizeDimension = (value?: number) => {
+  if (typeof value !== 'number' || !Number.isFinite(value)) {
+    return undefined;
+  }
+
+  const rounded = Math.round(value);
+  if (rounded <= 0) {
+    return undefined;
+  }
+
+  return Math.min(rounded, MAX_COVER_DIMENSION);
+};
+
+export const getSizedCoverUrl = (
+  preview?: string,
+  { width, height, format = DEFAULT_COVER_FORMAT }: SizedCoverUrlOptions = {},
+) => {
+  if (!preview) {
+    return preview;
+  }
+
+  const isRelativeUrl = preview.startsWith('/');
+
+  let url: URL;
+  try {
+    url = new URL(preview, LOCAL_URL_BASE);
+  } catch {
+    return preview;
+  }
+
+  if (!url.pathname.includes(COVER_PROXY_PATH)) {
+    return preview;
+  }
+
+  const normalizedWidth = normalizeDimension(width);
+  const normalizedHeight = normalizeDimension(height);
+
+  if (normalizedWidth !== undefined) {
+    url.searchParams.set('w', String(normalizedWidth));
+  }
+
+  if (normalizedHeight !== undefined) {
+    url.searchParams.set('h', String(normalizedHeight));
+  }
+
+  if (format) {
+    url.searchParams.set('format', format);
+  }
+
+  const search = url.searchParams.toString();
+  const relativeUrl = `${url.pathname}${search ? `?${search}` : ''}${url.hash}`;
+  return isRelativeUrl ? relativeUrl : url.toString();
+};
diff --git a/tests/core/test_image_cache.py b/tests/core/test_image_cache.py
index 27783f08..3d147dca 100644
--- a/tests/core/test_image_cache.py
+++ b/tests/core/test_image_cache.py
@@ -1,8 +1,25 @@
 """Tests for targeted image cache safety and fetch fallbacks."""
 
+from io import BytesIO
+
 import requests
+from PIL import Image
+
+from shelfmark.core.image_cache import (
+    ImageCacheService,
+    build_variant_cache_id,
+    create_image_variant,
+    normalize_variant_dimension,
+    normalize_variant_format,
+)
 
-from shelfmark.core.image_cache import ImageCacheService
+
+def _make_image_bytes(
+    *, width: int = 400, height: int = 600, image_format: str = "JPEG", color: str = "navy"
+) -> bytes:
+    buffer = BytesIO()
+    Image.new("RGB", (width, height), color=color).save(buffer, format=image_format)
+    return buffer.getvalue()
 
 
 def test_is_safe_url_rejects_invalid_ipv6_url() -> None:
@@ -20,3 +37,58 @@ def fake_get(*args, **kwargs):
 
     assert cache.fetch_and_cache("cover-1", "https://example.com/cover.jpg") is None
     assert "cover-1" not in cache._index
+
+
+def test_create_image_variant_resizes_and_transcodes_to_webp() -> None:
+    variant = create_image_variant(
+        _make_image_bytes(),
+        width=120,
+        height=180,
+        image_format="webp",
+    )
+
+    assert variant is not None
+    variant_bytes, content_type = variant
+    assert content_type == "image/webp"
+
+    with Image.open(BytesIO(variant_bytes)) as image:
+        assert image.size == (120, 180)
+
+
+def test_create_image_variant_preserves_aspect_ratio_for_single_dimension() -> None:
+    variant = create_image_variant(
+        _make_image_bytes(),
+        width=120,
+        image_format="jpeg",
+    )
+
+    assert variant is not None
+    variant_bytes, content_type = variant
+    assert content_type == "image/jpeg"
+
+    with Image.open(BytesIO(variant_bytes)) as image:
+        assert image.size == (120, 180)
+
+
+def test_create_image_variant_returns_none_when_no_change_needed() -> None:
+    image_bytes = _make_image_bytes(image_format="WEBP")
+
+    assert create_image_variant(image_bytes, image_format="webp") is None
+
+
+def test_variant_helpers_normalize_requested_variant_values() -> None:
+    assert normalize_variant_dimension("240") == 240
+    assert normalize_variant_dimension("0") is None
+    assert normalize_variant_dimension("99999") == 1024
+    assert normalize_variant_format("jpg") == "jpeg"
+    assert normalize_variant_format("weBp") == "webp"
+    assert normalize_variant_format("gif") is None
+    assert (
+        build_variant_cache_id(
+            "cover-123",
+            width=120,
+            height=180,
+            image_format="webp",
+        )
+        == "cover-123__w120_h180_fwebp"
+    )
diff --git a/uv.lock b/uv.lock
index 94fa2733..72783e7a 100644
--- a/uv.lock
+++ b/uv.lock
@@ -714,6 +714,39 @@ wheels = [
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 ]
 
+[[package]]
+name = "pillow"
+version = "12.2.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/8c/21/c2bcdd5906101a30244eaffc1b6e6ce71a31bd0742a01eb89e660ebfac2d/pillow-12.2.0.tar.gz", hash = "sha256:a830b1a40919539d07806aa58e1b114df53ddd43213d9c8b75847eee6c0182b5", size = 46987819, upload-time = "2026-04-01T14:46:17.687Z" }
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+]
+
 [[package]]
 name = "pip"
 version = "26.0.1"
@@ -1337,6 +1370,7 @@ dependencies = [
     { name = "gevent" },
     { name = "gevent-websocket" },
     { name = "gunicorn" },
+    { name = "pillow" },
     { name = "psutil" },
     { name = "python-socketio" },
     { name = "qbittorrent-api" },
@@ -1379,6 +1413,7 @@ requires-dist = [
     { name = "gevent" },
     { name = "gevent-websocket" },
     { name = "gunicorn" },
+    { name = "pillow", specifier = ">=11.0.0" },
     { name = "psutil" },
     { name = "pyautogui", marker = "extra == 'browser'" },
     { name = "python-socketio" },