perf: tighten director tag and segment helpers

js/ltx_director.js

@@ -53,7 +53,15 @@ function stripAudioSegmentTransient(s) {
 }
 
 function dedupeById(items = []) {
-  return items.filter((seg, index, self) => index === self.findIndex((s) => s.id === seg.id));
+  const seen = new Set();
+  const deduped = [];
+  for (const seg of items || []) {
+    const id = seg?.id;
+    if (!id || seen.has(id)) continue;
+    seen.add(id);
+    deduped.push(seg);
+  }
+  return deduped;
 }
 
 function findActiveSegmentAtFrame(segments = [], targetFrame, type) {
@@ -61,6 +69,10 @@ function findActiveSegmentAtFrame(segments = [], targetFrame, type) {
     (seg) => seg?.type === type && targetFrame >= seg.start && targetFrame < seg.start + seg.length
   );
 }
+
+function segmentMatchesAudioSource(seg, audioFile, blobUrl) {
+  return !!seg && (seg.audioFile === audioFile || seg._blobUrl === blobUrl);
+}
 
 function hideWidget(w) {
   if (!w) return;
@@ -2004,6 +2016,14 @@ class TimelineEditor {
     return found;
   }
 
+  _forEachMatchingAudioSegment(audioFile, blobUrl, visitor) {
+    for (const seg of this.timeline.audioSegments || []) {
+      if (segmentMatchesAudioSource(seg, audioFile, blobUrl)) {
+        visitor(seg);
+      }
+    }
+  }
+
   _getSegmentsByFileKey(fileKey) {
     const matches = [];
     this._forEachMatchingSegment(fileKey, (seg) => {
@@ -2231,11 +2251,10 @@ class TimelineEditor {
 
       const audioBuffer = await this._loadAudioBuffer(seg);
 
-      const matchingSegs = this.timeline.audioSegments.filter(s => s.audioFile === seg.audioFile || s._blobUrl === seg._blobUrl);
-      for (const s of matchingSegs) {
-        s._audioBuffer = audioBuffer;
-        s._decoding = false;
-      }
+      this._forEachMatchingAudioSegment(seg.audioFile, seg._blobUrl, (s) => {
+        s._audioBuffer = audioBuffer;
+        s._decoding = false;
+      });
     } catch (err) {
       console.warn("Failed to preload audio segment:", err);
       seg._decoding = false;