Web Vitals
Review LCP, INP, CLS, FCP, and TTFB values from this tab or enter values you already measured. This page does not fetch or measure another URL.
Metric values are local. Current-tab readings depend on browser support and page activity.
| Metric | Value | Rating |
|---|
A QUICK WALKTHROUGH
How to use this tool
- Enter measured values, or start the current-tab observer.
- Review each metric and its good, needs-improvement, or poor rating.
- Use the result as a local snapshot; browser support and page activity affect what is available.
Current tab only
The observer reads browser Performance APIs for this page. It does not request a URL, run a remote audit, or report field data for another site.
Manual values stay local
Manual entries are calculated in this browser and are not uploaded or saved.
GOOD TO KNOW
Common questions
Can this test another website?
No. It only observes the current tab or calculates values you enter.
Why can a metric be unavailable?
Some metrics require browser support or an event that has not occurred yet. Use manual entry when you have a measured value.