diff --git a/backend/__pycache__/jules_engine.cpython-312.pyc b/backend/__pycache__/jules_engine.cpython-312.pyc
index e245657..65da142 100644
Binary files a/backend/__pycache__/jules_engine.cpython-312.pyc and b/backend/__pycache__/jules_engine.cpython-312.pyc differ
diff --git a/backend/__pycache__/main.cpython-312.pyc b/backend/__pycache__/main.cpython-312.pyc
index 326c467..e2682a0 100644
Binary files a/backend/__pycache__/main.cpython-312.pyc and b/backend/__pycache__/main.cpython-312.pyc differ
diff --git a/backend/__pycache__/models.cpython-312.pyc b/backend/__pycache__/models.cpython-312.pyc
index a1357dc..2a576a9 100644
Binary files a/backend/__pycache__/models.cpython-312.pyc and b/backend/__pycache__/models.cpython-312.pyc differ
diff --git a/backend/main.py b/backend/main.py
index fb88c85..d91a78e 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -28,13 +28,16 @@
 
 # 🛡️ Configuración Maestra (abvetos.com) - Secrets moved to environment variables
 SECRET_KEY = os.getenv("LVT_SECRET_KEY", "DEVELOPMENT_SECRET_DO_NOT_USE_IN_PROD")
+# Pre-encode secret key to bytes to save redundant encoding operations
+SECRET_KEY_BYTES = SECRET_KEY.encode()
 PATENT = "PCT/EP2025/067317"
 
 def verify_auth(user_id: str, token: str) -> bool:
     try:
         ts, sig = token.split('.')
         if int(time.time()) - int(ts) > 600: return False # Ventana 10 min
-        expected = hmac.new(SECRET_KEY.encode(), f"{user_id}:{ts}".encode(), hashlib.sha256).hexdigest()
+        # Optimization: Use pre-encoded SECRET_KEY_BYTES
+        expected = hmac.new(SECRET_KEY_BYTES, f"{user_id}:{ts}".encode(), hashlib.sha256).hexdigest()
         return hmac.compare_digest(sig, expected)
     except: return False
 
@@ -50,7 +53,7 @@ def calculate_fit(user_waist: float, item_id: str):
     return is_perfect, round(fit_index, 3), item
 
 @app.post("/api/recommend")
-async def recommend_garment(scan: UserScan, garment_id: str = "BALMAIN_SS26_SLIM"):
+def recommend_garment(scan: UserScan, garment_id: str = "BALMAIN_SS26_SLIM"):
     # 1. Seguridad y Handshake
     if not verify_auth(scan.user_id, scan.token):
         raise HTTPException(status_code=403, detail="Acceso restringido al búnker.")
diff --git a/backend/tests/__pycache__/test_main.cpython-312-pytest-9.0.2.pyc b/backend/tests/__pycache__/test_main.cpython-312-pytest-9.0.2.pyc
index 8ee3541..a36d1de 100644
Binary files a/backend/tests/__pycache__/test_main.cpython-312-pytest-9.0.2.pyc and b/backend/tests/__pycache__/test_main.cpython-312-pytest-9.0.2.pyc differ
diff --git a/js/main.js b/js/main.js
index 56a1cb6..fbf12bc 100644
--- a/js/main.js
+++ b/js/main.js
@@ -35,6 +35,12 @@ class TryOnYouBunker {
         this.selectedGarmentId = "BALMAIN_SS26_SLIM";
         this.version = "11.0.0";
         this.biometricAnalyzer = new MediaPipeBiometricAnalyzer();
+        // Performance: Cache frequently accessed DOM elements
+        this.dom = {
+            resultContainer: document.getElementById('jules-result'),
+            resultText: document.getElementById('recommendation-text'),
+            submitBtn: null // Assigned in handleDivineoExecution for contextual accuracy if needed
+        };
         this.shopifyInventory = {
             "BALMAIN_SS26_SLIM": {
                 "name": "Balmain Slim-Fit Jeans",
@@ -111,9 +117,13 @@ class TryOnYouBunker {
         const formData = new FormData(event.target);
         const eventType = formData.get('event_type');
 
-        const resultContainer = document.getElementById('jules-result');
-        const resultText = document.getElementById('recommendation-text');
-        const submitBtn = event.target.querySelector('button[type="submit"]');
+        // Performance: Re-use cached DOM or cache it once
+        const resultContainer = this.dom.resultContainer;
+        const resultText = this.dom.resultText;
+        if (!this.dom.submitBtn) {
+            this.dom.submitBtn = event.target.querySelector('button[type="submit"]');
+        }
+        const submitBtn = this.dom.submitBtn;
 
         try {
             submitBtn.innerHTML = '<span class="loader"></span> EXECUTING DIVINEO TOTALITY...';
@@ -211,11 +221,13 @@ class TryOnYouBunker {
     }
 
     applyLuxuryTransitions() {
-        const observer = new IntersectionObserver((entries) => {
+        const observer = new IntersectionObserver((entries, observer) => {
             entries.forEach(entry => {
                 if (entry.isIntersecting) {
                     entry.target.style.opacity = '1';
                     entry.target.style.transform = 'translateY(0)';
+                    // Performance: Unobserve after transition to save resources
+                    observer.unobserve(entry.target);
                 }
             });
         }, { threshold: 0.1 });