Overview
PageSpeed Insights (PSI) provides both lab and field data about a page. Lab data is useful for debugging performance issues, as it is collected in a controlled environment. Field data is useful for capturing true, real-world user experience.
Data Sources
- Lab Data: Collected using Lighthouse in a simulated environment.
- Field Data: Collected from the Chrome User Experience Report (CrUX), representing real-world performance over the last 28 days.
Benefits
PSI gives a clear 'Pass' or 'Fail' grade for Core Web Vitals and provides actionable recommendations to improve performance.