Understanding Core Web Vitals

Performance — 22% (Free) / 18% (Pro)

Method: live Lighthouse score when available, else deduction-based.

Checks:

  • Core Web Vitals — LCP, INP, CLS, FCP, TTFB (each rated good / needs-improvement / poor)
  • plus HTTP/2 usage
  • compression
  • caching headers
  • render-blocking resources
  • unused CSS/JS
  • page weight
  • DOM size
  • mobile-vs-desktop performance gap check.

Performance’s category score uses live Lighthouse/PageSpeed data directly when available, falling back to the deduction method only if that data is missing.