Performance

Reference cards for web performance: Core Web Vitals (LCP, INP, CLS), preload and prefetch hints, fetch priority, and runtime measurement APIs.

• 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.