The original headline is "How We Cut Our Browser Video Renderer's Frame Time by 80%"

Short summary

A detailed engineering writeup on cutting browser video renderer frame time by 80%, from ~0.9s to ~90-165ms per frame. Four distinct bottlenecks were identified and fixed in a single commit: unnecessary overlay processing during export, WebGL context teardown on every bbox change, cache invalidation on transform-only animations, and a verification-pass bug. Fixes included gating UI work on export, an LRU pool for WebGL compositors, and a two-level cache separating content from transform.

• •Four bottlenecks found: wasted overlay processing, WebGL context churn, cache invalidation on transforms, and a verification bug
• •Key fix: two-level cache separating content identity from transform state, avoiding re-rasterization of identical layers
• •Frame time dropped from ~0.9s to ~90-165ms with pixel-level verification of unchanged output

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