Core Web Vitals are three specific metrics Google uses to measure user experience, defined and documented on web.dev (opens in new tab): Largest Contentful Paint (loading speed), Interaction to Next Paint (responsiveness), and Cumulative Layout Shift (visual stability). They are a confirmed ranking factor and directly affect how a page feels to use.
Why All Three Metrics Matter Together
A page can score well on one metric and poorly on another — fast to load but visually jumpy as images pop in, for example — and Google evaluates all three together rather than any single one in isolation. Fixing the weakest of the three usually delivers the biggest overall improvement, which is why checking a breakdown by metric matters more than looking at a single combined score.
The scores are also measured from real visitor data over time (field data), not just a single lab test, so improvements can take a few weeks to fully show up in Search Console’s report.
People also ask
How do I check my Core Web Vitals score?
Google’s free PageSpeed Insights tool and Search Console’s Core Web Vitals report both show real-world scores for any public URL.
See also
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