Measurement methodology — how ControlVitals computes metrics
A transparent overview explains data provenance, the difference between field and lab measurements, and the thresholds used.
Core Web Vitals
- LCP measures main-content loading
- INP measures responsiveness to user interactions
- CLS measures visual stability
Data layers
- CrUX provides aggregate real-user data
- Lighthouse and Playwright use controlled conditions
- Field and lab results are interpreted separately