Demystifying Lighthouse, CrUX, and Core Web Vitals
summary
Explains that Lighthouse derives scores from HTTP Archive real‑user percentiles so top 10% = good while bottom ranges score poorly, and that PageSpeed Insights merges Lighthouse lab runs (executed in Google datacenters on a Moto G4) with 28‑day field data from the Chrome User Experience Report. Distinguishes lab vs field data for when to debug (lab) versus when to optimize for real users (field), gives concrete CWV thresholds (LCP ~2.5s, FID 100ms, CLS ~0.1) and notes mobile‑only SEO impact uses the 75th percentile rule.
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chapters (11)
- 0:00Performance measurement tools
- 3:21Evolution of web tools
- 5:07Deep dive into Lighthouse
- 9:19How Lighthouse scores work
- 11:51Core Web Vitals explained
- 14:56Lighthouse audit limits
- 17:24Lab vs field data
- 20:34Chrome User Experience Report explained
- 23:02PageSpeed Insights tips
- 23:46Core Web Vitals and SEO
- 25:54Open source contributions
