SEO2026-05-17
Core Web Vitals
Also known as: CWV / コアウェブバイタル
Google's three core page experience metrics: LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift). All three are confirmed Google ranking signals.
The Three Metrics
LCP measures whether the largest visible element paints within 2.5 s. INP tracks responsiveness across all interactions (target: under 200 ms). CLS measures visual stability (target: under 0.1). INP officially replaced FID as a Core Web Vital in March 2024.
Optimization Approaches
Key tactics include using Next.js Image and font-display:swap for LCP, offloading event handlers for INP, and setting explicit dimensions on dynamic content to eliminate CLS. See our SEO checklist for a full implementation guide.
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