Engineering · Term
Core Web Vitals
Core Web Vitals are three metrics Google uses to quantify user experience: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness), and Cumulative Layout Shift (visual stability).
The recommended targets are LCP under 2.5 seconds, INP under 200 milliseconds, and CLS under 0.1, measured on real-world traffic. They are part of how Google assesses page experience, but their bigger value is that they describe whether a site actually feels fast and stable to use.
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