Core Web Vitals
Google's metrics for measuring real-world page experience.
Core Web Vitals are a set of metrics Google uses to measure user-centric page performance: Largest Contentful Paint (LCP — loading speed), Interaction to Next Paint (INP — interactivity, replaced FID in 2024), and Cumulative Layout Shift (CLS — visual stability). Together they form a key page-experience ranking signal.
Meeting Core Web Vitals thresholds is increasingly important for SEO. Pages that fail CWV may rank lower than they otherwise would.
A website has LCP 3.8s (poor), INP 250ms (poor), CLS 0.18 (poor). After optimization: LCP 1.9s (good), INP 120ms (good), CLS 0.05 (good). Rankings on competitive queries improve over 3-6 months.
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