Core Web Vitals history
Each test you run on CoreVitals is kept here, in this browser only. Re-test after every deploy and watch the line.
Why track history rather than one-off tests
A single Lighthouse run is noisy; a trend isn’t. Test the same URL after each release, ideally two or three times, and the line shows whether a new script, image or font actually moved LCP or Total Blocking Time.
Real-user values move slowly because the Chrome UX Report uses a rolling 28-day window. A fix shipped today shows up fully in field data about four weeks later, so don’t panic if the real-user line lags the lab line.
History lives in your browser’s localStorage (up to 300 tests). Clearing browser data, or the button above, removes it. See privacy.