Measure page speed

LCP–

CLS–

TTFB–

Load–

Lab or field

These are lab numbers: one load, in this browser, on this network, like Lighthouse or the DevTools Performance panel. Core Web Vitals are judged on field data: real Chrome visits in the Chrome UX Report (CrUX), shown in PageSpeed Insights, at the 75th percentile.

INP, the third Core Web Vital, needs a real interaction, so a page that has just loaded has none to report. Load time is not a Core Web Vital and has no Google threshold.