From 76af4545c6e1b2839e97eff8d909cff80d9cf695 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Fri, 6 Mar 2026 16:39:01 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Bolt:=20Batch=20DOM=20insertions=20?=
 =?UTF-8?q?in=20index.html=20for=20performance?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Uses a DocumentFragment to batch DOM appends when rendering the file
list. This prevents layout thrashing (O(N) synchronous reflows) and makes
the UI more responsive for repositories with many staged files.

Added journal entry for this optimization in .jules/bolt.md.

Co-authored-by: PrakharMNNIT <73683289+PrakharMNNIT@users.noreply.github.com>
---
 .jules/bolt.md    | 5 ++++-
 public/index.html | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/.jules/bolt.md b/.jules/bolt.md
index 68b59a4..436d317 100644
--- a/.jules/bolt.md
+++ b/.jules/bolt.md
@@ -1,3 +1,6 @@
 ## 2024-05-18 - Optimize asynchronous file operations and child processes in `services/ReviewGenerator.js`
 **Learning:** `generateSplitReviews` and `generateUnifiedReview` previously executed Git operations (e.g. `GitService.getDiffForFile`) and file write operations (`fs.writeFileSync`) sequentially within a `for...of` loop. For large PRs or repos with many changed files, this sequential execution significantly bottlenecks review generation time.
-**Action:** Replace `for...of` loops over `includedFiles` with an array of Promises processed via `Promise.all`. This allows Git diffs to be requested and files to be written in parallel, substantially cutting down end-to-end execution time for large payloads. It is critical to use asynchronous I/O (`fs.promises.writeFile`) instead of synchronous alternatives.
\ No newline at end of file
+**Action:** Replace `for...of` loops over `includedFiles` with an array of Promises processed via `Promise.all`. This allows Git diffs to be requested and files to be written in parallel, substantially cutting down end-to-end execution time for large payloads. It is critical to use asynchronous I/O (`fs.promises.writeFile`) instead of synchronous alternatives.
+## 2024-05-20 - Batching DOM insertions using DocumentFragment
+**Learning:** `loadFiles()` in `public/index.html` was directly appending `fileDiv` nodes inside a `forEach` loop over staged files `container.appendChild(fileDiv)`. For repositories with many staged files, this triggers synchronous reflows and layout recalculations (layout thrashing) for every file added, significantly reducing UI responsiveness.
+**Action:** Used a `DocumentFragment` to batch DOM node appends. The nodes are built in-memory and then attached to the live DOM tree in a single `container.appendChild(fragment)` operation, turning O(N) reflow operations into an O(1) operation.
diff --git a/public/index.html b/public/index.html
index 44fbbc0..e19a64b 100644
--- a/public/index.html
+++ b/public/index.html
@@ -1156,6 +1156,8 @@ <h3>No Staged Changes</h3>
                 container.innerHTML = '';
 
                 // Enhanced file processing with better icons and metadata
+                // ⚡ Bolt: Batch DOM insertions using a DocumentFragment to prevent O(N) layout thrashing
+                const fragment = document.createDocumentFragment();
                 data.files.forEach((file, index) => {
                     const fileId = file.replace(/[^a-zA-Z0-9]/g, '_');
                     const fileExt = file.substring(file.lastIndexOf('.')).toLowerCase();
@@ -1248,8 +1250,9 @@ <h3>No Staged Changes</h3>
                             </div>
                         </div>
                     `;
-                    container.appendChild(fileDiv);
+                    fragment.appendChild(fileDiv);
                 });
+                container.appendChild(fragment);
             } catch (error) {
                 document.getElementById('fileList').innerHTML = `
                     <div class="error-message">