DevTools & The Performance Tab
summary
Chrome DevTools’ Performance panel now surfaces lab and 28‑day field metrics side‑by‑side (examples: ESPN, Inter Miami), pulls CRUX field data to compare real user vs synthetic traces, and breaks LCP into the four Walton phases to show a 6s resource load bottleneck. New features include resource tooltips, clickable LCP element jump-to-code, layout‑shift timeline with diamonds and animation, trace annotations that save with the trace for sharing, and AI assistance (Canary, experimental) that returns fix suggestions and code snippets. Numbers cited: 1.2B websites, 250k deploys/day, 5.5B browser users.
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chapters (11)
- 0:00Welcome and intro
- 3:57Why performance matters
- 9:16Evolution of DevTools
- 13:12Lab vs field metrics
- 17:27Throttling and CPU slowdown
- 18:10Understanding LCP breakdown
- 20:15Improved tooltips and annotations
- 22:22Collaborative performance auditing
- 23:07CLS debugging with animations
- 24:57DevTools AI assistance
- 26:41Summary and closing
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