Measured cold-cache behaviour: thumbnails ~2ms, HEVC video playback
12-21s TTFB because libx264 transcodes inline and serialised one
ffmpeg at a time. Sibling thumbs unaffected (~2ms during transcode).
With 11/45 .mov files already pre-baked, ~75% of clicks were cold.
Ran `photoprism convert` to bring sidecar coverage to 45/45; previously
cold videos now serve in ~2ms TTFB.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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