Performance
Reference cards for web performance: Core Web Vitals (LCP, INP, CLS), preload and prefetch hints, fetch priority, and runtime measurement APIs.
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Core Web Vitals: LCP, INP, CLS
Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift are the three field-measured metrics Google uses for the Page Experience signal. Targets: 2.5s, 200ms, 0.1.