Core Web Vitals
Core Web Vitals are three measurements Google uses to describe real-world page experience: loading speed (Largest Contentful Paint), responsiveness (Interaction to Next Paint) and visual stability (Cumulative Layout Shift). Good scores mean the page loads quickly, reacts promptly and does not jump around.
In practice
What it means when you are the one making the decision.
Google publishes target thresholds for a good experience, measured at the 75th percentile of real visits: LCP within 2.5 seconds, INP within 200 milliseconds and CLS of 0.1 or less. Lab tools such as Lighthouse estimate these, but field data from real users is what counts.
These metrics are one signal among many in search and a direct measure of whether visitors are frustrated. Improving them usually means smaller images, less script, reserved space for late-loading elements and avoiding heavy work on the main thread.
Example
A page whose hero image loads slowly on a mid-range phone has a poor LCP. Serving a correctly sized image and loading it first fixes the number and the experience.
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