Core Web Vitals
01 Definition
Core Web Vitals meaning: Google's set of user experience metrics for loading, interactivity, and visual stability.
Core Web Vitals are three Google metrics that measure page experience: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness, and Cumulative Layout Shift for visual stability. Google uses them as a minor ranking signal and reports field data from real visitors.
Also called
Why it matters
How Core Web Vitals fits the work
They turn vague speed complaints into measurable targets, giving teams a shared, Google-defined standard for judging real user experience.
In context
A store cuts its Largest Contentful Paint from 4.2 seconds to 2.1 seconds and moves that Core Web Vital into Google's good range.
Practical note
Google treats them as a small ranking factor, not a magic lever. Optimize the field data from real users, since lab scores can differ from what visitors experience.