[playlists] Speed up large playlist loading#2052
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frankrousseau merged 2 commits intoJun 14, 2026
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…ively Opening a large playlist froze the main thread: every preview revision shipped its annotation blob, and all entity cards mounted at once. - Fetch annotations on demand for the current preview and a ±2 sliding window, cached in previewFileMap with in-flight dedup (reuses GET /api/data/preview-files/<id>). - Mount the PlaylistedEntity strip in batches of 40 via requestIdleCallback so the UI is interactive immediately; scrollToEntity self-heals if an entity is not mounted yet. - Draw lazily-loaded annotations without seeking the player (loadSingleAnnotation rather than loadAnnotation) so the async load can't move the timeline. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
On long clips each frame falls below 3px and the per-frame stripes are dropped, which exposed the light base background and looked like a bug. Paint the dense fallback a solid dark grey matching the stripe tone. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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