diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 0000000000..7094bd08a3
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,3 @@
+## 2025-04-28 - Optimize React list sorting
+**Learning:** For optimal performance in React list rendering, prefer lexicographical string comparison (e.g., `b.updatedAt.localeCompare(a.updatedAt)`) over `new Date()` allocation when sorting by ISO 8601 timestamps, and always memoize the derived list to prevent O(n log n) object allocation overhead on re-renders.
+**Action:** Always memoize derived lists and avoid `new Date()` object allocation in sorting functions for ISO 8601 strings.
diff --git a/apps/app/src/components/ConversationsSidebar.tsx b/apps/app/src/components/ConversationsSidebar.tsx
index 75d768bee2..1b1340eb68 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 lexicographical string comparison for O(n log n) object allocation overhead on re-renders
+  const sortedConversations = useMemo(() => {
+    return [...conversations].sort((a, b) =>
+      b.updatedAt.localeCompare(a.updatedAt),
+    );
+  }, [conversations]);
 
   const handleDoubleClick = (conv: { id: string; title: string }) => {
     setEditingId(conv.id);