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Miguel Ángel
0f938841cd
Two perf fixes caught in #1118 review: 1. Cache guard: probeAndCacheVolumeKeyframes now short-circuits when the element is already in volumeKeyframeCache. Without the guard every bindMediaMetadataListeners call (every 30 RAF ticks) re-probed all bound elements — N elements × full-composition timeline seeks at 60 Hz regardless of whether keyframes were already known. bindRootTimelineIfAvailable still clears the cache on a new timeline capture so keyframes stay fresh when the composition is rebound. 2. PCM cursor: audioVolumeEnvelope.ts had the incremental segment cursor (O(N+M) overall) before #1118 extracted the interpolation into interpolateVolumeGain. The shared function restarts from segment=0 on each call — fine for the preview path (one call per RAF tick) but O(N×M) for the PCM path (one call per sample: 48 kHz × duration). Napkin math: a 10-min render went from ~30M to ~460M ops. Restored the inline incremental scan in the engine bake loop; engine now only imports normaliseEnvelope from core.