From a51cc76afabcf9ecfd64cb43fbab79b59c82becd Mon Sep 17 00:00:00 2001
From: Dexploarer <211557447+Dexploarer@users.noreply.github.com>
Date: Mon, 27 Apr 2026 00:59:48 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Bolt:=20Optimize=20conversation=20l?=
 =?UTF-8?q?ist=20sorting=20to=20prevent=20unnecessary=20re-renders?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Added useMemo to the conversation list sorting and replaced the expensive `new Date().getTime()` allocation with lexicographical string comparison via `localeCompare` on ISO 8601 timestamps.
---
 .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..895bfbeecf
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,3 @@
+## 2025-04-27 - Fast Lexicographical Time Sorting
+**Learning:** In heavily used UI components like React sidebars that display lists updated in real-time, relying on `.sort()` blocks combined with inline `new Date(string).getTime()` allocation causes measurable re-render lag due to memory allocation and date parsing overhead on every tick. For standard ISO 8601 strings (like `updatedAt`), the sorting structure is inherently chronologically sound and allows for fast alphabetical comparison.
+**Action:** When implementing real-time list sorting by ISO timestamp on the frontend, always combine array memoization (`useMemo`) with native `.localeCompare()` instead of allocating `Date` objects on every re-render.
diff --git a/apps/app/src/components/ConversationsSidebar.tsx b/apps/app/src/components/ConversationsSidebar.tsx
index 75d768bee2..2ef7e2dae4 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;
-  });
+  // ⚡ Bolt: Memoize the sorting and use localeCompare for timestamps instead of parsing Date
+  const sortedConversations = useMemo(() => {
+    return [...conversations].sort((a, b) =>
+      b.updatedAt.localeCompare(a.updatedAt),
+    );
+  }, [conversations]);
 
   const handleDoubleClick = (conv: { id: string; title: string }) => {
     setEditingId(conv.id);