// Performance
Core Web Vitals are Google's current set of three field-measurable metrics for important parts of page experience: Largest Contentful Paint (LCP) measures loading performance, Interaction to Next Paint (INP) measures responsiveness to user interactions, and Cumulative Layout Shift (CLS) measures visual stability. The set can evolve as the web and available measurements change.
Why it matters: The current “good” targets are LCP at 2.5 seconds or less, INP at 200 milliseconds or less, and CLS at 0.1 or less, evaluated at the 75th percentile of page views separately for mobile and desktop. Use real-user field data to understand what visitors experience and lab tools to reproduce and diagnose specific problems; the two sources can differ because of devices, networks, interactions, geography, and sample coverage. Google uses Core Web Vitals within its ranking systems, but passing them does not produce a guaranteed ranking boost and a perfect score is not a substitute for relevant content or a usable page. Prioritise changes that improve the actual experience.
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