From 1c6b57baf14011ade620ff0590a21ebdf520de49 Mon Sep 17 00:00:00 2001
From: Dexploarer <211557447+Dexploarer@users.noreply.github.com>
Date: Thu, 30 Apr 2026 00:52:00 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Bolt:=20Optimize=20timestamp=20sort?=
 =?UTF-8?q?ing=20in=20ConversationsSidebar?=
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- Wrap conversation sorting logic in `useMemo` to prevent sorting on every render.
- Replace `new Date(a.updatedAt).getTime()` with raw string comparison for O(n log n) performance improvements, eliminating unnecessary Date allocation overhead.
- Documented learning in `.jules/bolt.md`.
---
 .jules/bolt.md                                   |  3 +++
 apps/app/src/components/ConversationsSidebar.tsx | 13 +++++++------
 2 files changed, 10 insertions(+), 6 deletions(-)
 create mode 100644 .jules/bolt.md

diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 0000000000..8018f03b62
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,3 @@
+## 2026-04-30 - Optimize React List Rendering Timestamp Sorting
+**Learning:** Using new Date() allocations inside array sorts within React components leads to unnecessary memory allocation and performance overhead on every re-render.
+**Action:** Always memoize derived lists that require sorting and prefer raw string comparisons (e.g., b.updatedAt > a.updatedAt) for ISO 8601 timestamp fields over allocating Date objects.
diff --git a/apps/app/src/components/ConversationsSidebar.tsx b/apps/app/src/components/ConversationsSidebar.tsx
index 75d768bee2..6af6b97dbb 100644
--- a/apps/app/src/components/ConversationsSidebar.tsx
+++ b/apps/app/src/components/ConversationsSidebar.tsx
@@ -2,7 +2,7 @@
  * Conversations sidebar component — left sidebar with conversation list.
  */
 
-import { useEffect, useRef, useState } from "react";
+import { useEffect, useMemo, useRef, useState } from "react";
 import { useApp } from "../AppContext";
 
 interface ConversationsSidebarProps {
@@ -54,11 +54,12 @@ export function ConversationsSidebar({
     }
   }, [editingId]);
 
-  const sortedConversations = [...conversations].sort((a, b) => {
-    const aTime = new Date(a.updatedAt).getTime();
-    const bTime = new Date(b.updatedAt).getTime();
-    return bTime - aTime;
-  });
+  const sortedConversations = useMemo(() => {
+    return [...conversations].sort((a, b) => {
+      // ⚡ Bolt: Memoize the sorting and use raw string comparison for O(n log n) performance without Date allocation overhead
+      return b.updatedAt > a.updatedAt ? 1 : b.updatedAt < a.updatedAt ? -1 : 0;
+    });
+  }, [conversations]);
 
   const handleDoubleClick = (conv: { id: string; title: string }) => {
     setEditingId(conv.id);