Vinicius Dallacqua at performance.sync()
summary
Claim: INP replaces FID and scores session-wide responsiveness by the worst interaction (or the 50th for very interactive sites), so it actually measures post-load interactivity rather than just first input. The talk gives concrete numbers—100 ms RAIL window, 50 ms long-task threshold—and shows tooling: long animation frames as the unit of work, Chrome DevTools attribution, Vercel DevTool and a live project PerfLab that identifies frames and attributions (noting blind spots for third parties and cross-origin handlers).
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chapters (10)
- 0:00Introduction
- 1:27Post-load performance focus
- 3:59Performance metrics history
- 6:30Early interactivity metrics
- 8:54TTI complexity and FID limits
- 11:46Total blocking time limits
- 13:31INP replaces FID
- 14:34Long Animation Frames
- 15:58Attribution in Long Animation Frames
- 17:39Summary
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