Updated May 2026
Reading Lighthouse metrics
Turn scores and technical signals into improvement decisions.
Main scores
Scores summarize quality areas, but they do not replace finding analysis. A score can hide an important issue if it affects a critical page.
Metrics to watch
- LCP for perceived main loading speed.
- CLS for visual stability.
- TBT as a lab signal for blocking and interactivity.
- FCP and Speed Index to understand load perception.