Performance · Website glossary

Core Web Vitals

Quick answer · What is Core Web Vitals?

A set of user-experience metrics covering loading, interaction responsiveness, and visual stability, currently LCP, INP, and CLS.

IN PRACTICE

Core Web Vitals: an example

A team reviews each metric for mobile visits instead of relying on one overall speed score.

KEEP IN MIND

Passing these metrics does not guarantee rankings, accessibility, or completion of the visitor's task.

Put the idea to work

Frequently asked questions

What is a practical example of Core Web Vitals?

A team reviews each metric for mobile visits instead of relying on one overall speed score.

Does passing Core Web Vitals guarantee rankings or usability?

Passing these metrics does not guarantee rankings, accessibility, or completion of the visitor's task.

Which concepts should I read alongside Core Web Vitals?

Largest Contentful Paint: LCP reports when the largest eligible visible content element in the initial viewport is rendered.
Interaction to Next Paint: INP assesses page responsiveness by examining the latency of qualifying interactions over a visit.