perf: paginate large voice libraries

CHANGELOG.md

@@ -43,6 +43,8 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
   changing those fields causes the existing pair to be flagged stale.
 - **Character Table Pagination.** Productions now render 50 character cards/rows at a time with an explicit Show more
   control, keeping sorting and record lookups intact while reducing DOM and image work for large casts.
+- **Voice Table Pagination.** The voice library now renders up to 50 sorted rows initially and adds a Show more
+  control for larger result sets, while retaining the full dataset for filtering and sorting.
 - **Upload Filename Boundaries.** Audio, STT, route-sound and picture uploads now reject path-like or control-character
   filenames before deriving extensions; voice ZIP imports also reject absolute, traversal and malformed archive paths.
 - **Security Regression Coverage.** Added a Python test gate for character metadata validation, private-download URL

TODO.md

@@ -53,8 +53,8 @@ the first block before investing in architecture or polish.
   cross-record validation so mismatched profile/reference files are detected even when both are current-version.
 - [ ] **M — Add bounded duplicate-generation protection.** Consistent portrait/reference jobs now deduplicate
   repeated requests with `Idempotency-Key`; extend the same bounded contract to voice and casting jobs.
-- [ ] **M — Improve large-table performance.** Character productions now paginate at 50 visible rows; paginate voice
-  tables, update only affected rows, and disable preloading on low-memory devices.
+- [ ] **M — Improve large-table performance.** Character productions and the flat voice library now paginate at 50
+  visible rows; updating only affected rows and disabling preloading on low-memory devices remain.
 - [ ] **M — Add explicit cache invalidation and eviction.** Fish.audio search responses now have bounded eviction;
   add equivalent LRU cleanup for audio/image entries and object URLs.
 - [ ] **M — Add constrained-device validation.** Test with Chrome CPU/memory throttling,

static/js/voice-library.js

@@ -1816,6 +1816,22 @@ function renderVoiceList() {
     return 0;
   });
 
+  // Keep the complete filtered/sorted list in memory, but avoid creating a
+  // large DOM (and hundreds of audio/image nodes) for big libraries.
+  const pageSignature = JSON.stringify([
+    cat, showDisabled, window._voiceGroupFilter || '', window._voiceTagFilter || '',
+    _libraryIssueFilter || '', _sortField, _sortDir, !!window._voiceTableView, _libraryFilters,
+  ]);
+  if (window._voicePageSignature !== pageSignature) {
+    window._voicePageSignature = pageSignature;
+    window._voicePage = 1;
+  }
+  const totalFiltered = filtered.length;
+  const pageSize = 50;
+  const page = Math.max(1, Number(window._voicePage) || 1);
+  const pageEnd = Math.min(totalFiltered, page * pageSize);
+  const pageItems = filtered.slice(0, pageEnd);
+
   updateLibraryInsights();
   if (_libraryIssueFilter) {
     const note = document.createElement('div');
@@ -1955,8 +1971,20 @@ function renderVoiceList() {
   if (window._voiceGroupByTag) renderVoicesByTag(list, filtered);
   else {
     const frag = document.createDocumentFragment();
-    filtered.forEach(v => frag.appendChild(makeVoiceRow(v)));
+    pageItems.forEach(v => frag.appendChild(makeVoiceRow(v)));
     list.appendChild(frag);
+    if (pageEnd < totalFiltered) {
+      const more = document.createElement('button');
+      more.type = 'button';
+      more.className = 'btn-secondary vl-load-more';
+      more.style.margin = '12px 0';
+      more.textContent = `Show more voices (${pageEnd} / ${totalFiltered})`;
+      more.addEventListener('click', () => {
+        window._voicePage = page + 1;
+        renderVoiceList();
+      });
+      list.appendChild(more);
+    }
   }
   if (_pendingSelectId) {
     const wrap = list.querySelector(`[data-id="${CSS.escape(_pendingSelectId)}"]`);