perf(studio): virtualize timeline thumbnail media#2718
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This was referenced Jul 21, 2026
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What
Virtualize image, video, and composition thumbnail media inside timeline clip shells.
Why
Row and clip virtualization should also prevent expensive media elements from decoding outside the active window.
How
Keep stable clip geometry while mounting rich media only for eligible visible work, using the shared scheduler and decoder leases. Update image/video component tests for lifecycle and fallback behavior.
Test plan
Family G tip validation: 78 changed-surface Studio tests, 19 focused server tests, 3,026 full Studio tests, 406 full Studio Server tests, both typechecks, format, lint, file-size gate, and full workspace build.