From 1957734a876c8b27adc55e45317e5311104f2aec Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Sun, 1 Mar 2026 13:21:48 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Bolt:=20Cache=20favorites=20to=20pr?=
 =?UTF-8?q?event=20redundant=20localStorage=20reads?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: MrAlokTech <107493955+MrAlokTech@users.noreply.github.com>
---
 .jules/bolt.md |  3 +++
 script.js      | 10 +++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 .jules/bolt.md

diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 0000000..a16f732
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,3 @@
+## 2025-02-14 - Redundant Synchronous localStorage Reads in Render Loop
+**Learning:** Calling `localStorage.getItem` and `JSON.parse` inside high-frequency render loops (like `renderPDFs` triggered on input events) causes unnecessary synchronous I/O and garbage collection overhead, bottlenecking the main thread.
+**Action:** Cache the results of expensive operations (like `localStorage` reads) in a memory variable (e.g., `favoritesCache`) and manually synchronize the cache when updates occur, completely skipping disk reads on subsequent renders.
diff --git a/script.js b/script.js
index bdc06f3..a484995 100644
--- a/script.js
+++ b/script.js
@@ -12,6 +12,7 @@ let searchTimeout;
 let adDatabase = {};
 let isModalHistoryPushed = false;
 let db; // Defined globally, initialized later
+let favoritesCache = null; // Cache for favorites
 
 // GAS
 const GAS_URL = "https://script.google.com/macros/s/AKfycby2lW5QdidC7o_JX0jlXa59uAjmmpFzOx-rye0N1x0r6hoYu-1CB65YrM1wPr7h-tZu/exec"
@@ -1316,8 +1317,13 @@ async function handleCommentSubmit(e) {
    10. EXTRAS (THEME, FAVORITES, EASTER EGGS)
    ========================================= */
 function getFavorites() {
+    // ⚡ Bolt: Use a global cache (favoritesCache) to avoid synchronous localStorage.getItem and JSON.parse on every call during high-frequency render loops (e.g. renderPDFs inside search inputs)
+    if (favoritesCache !== null) {
+        return favoritesCache;
+    }
     const stored = localStorage.getItem('classNotesFavorites');
-    return stored ? JSON.parse(stored) : [];
+    favoritesCache = stored ? JSON.parse(stored) : [];
+    return favoritesCache;
 }
 
 function toggleFavorite(event, pdfId) {
@@ -1336,6 +1342,8 @@ function toggleFavorite(event, pdfId) {
         favorites.push(pdfId);
         showToast('Added to saved notes');
     }
+    // ⚡ Bolt: Update the cache alongside localStorage to ensure the cache stays in sync
+    favoritesCache = favorites;
     localStorage.setItem('classNotesFavorites', JSON.stringify(favorites));
     renderPDFs();
 }