diff --git a/static/app.js b/static/app.js
index 1032f93..6b5943b 100644
--- a/static/app.js
+++ b/static/app.js
@@ -4,44 +4,6 @@ let currentMusicIndex = -1; // Index of the current music file
 let currentTrackPath  = "";
 let activeTranscriptAudio = ""; // Audio file that matches the currently open transcript.
 
-// Check thumb availability in parallel; sequentially generate missing ones to avoid concurrent creation.
-function ensureFirstFivePreviews() {
-  const images = Array.from(document.querySelectorAll('.images-grid img')).slice(0, 5);
-  if (!images.length) return;
-
-  const checks = images.map(img => {
-    const thumbUrl = img.dataset.thumbUrl || img.src;
-    const fullUrl = img.dataset.fullUrl;
-    return fetch(thumbUrl, { method: 'GET', cache: 'no-store' })
-      .then(res => ({
-        img,
-        thumbUrl,
-        fullUrl,
-        hasThumb: res.ok && res.status !== 204
-      }))
-      .catch(() => ({ img, thumbUrl, fullUrl, hasThumb: false }));
-  });
-
-  Promise.all(checks).then(results => {
-    const missing = results.filter(r => !r.hasThumb && r.fullUrl);
-    if (!missing.length) return;
-    generateThumbsSequentially(missing);
-  });
-}
-
-async function generateThumbsSequentially(entries) {
-  for (const { img, thumbUrl, fullUrl } of entries) {
-    try {
-      await fetch(fullUrl, { method: 'GET', cache: 'no-store' });
-      const cacheBust = `_=${Date.now()}`;
-      const separator = thumbUrl.includes('?') ? '&' : '?';
-      img.src = `${thumbUrl}${separator}${cacheBust}`;
-    } catch (e) {
-      // ignore; best effort
-    }
-  }
-}
-
 function getMainContainer() {
   return document.querySelector('main');
 }
@@ -437,7 +399,6 @@ function renderContent(data) {
 
   // Update gallery images for lightbox or similar
   currentGalleryImages = imageFiles.map(f => f.path);
-  ensureFirstFivePreviews();
 
   attachEventListeners();
 }