Google Core Web Vitals — LCP, CLS, and INP — are the official quality metrics for websites. LCP (Largest Contentful Paint) should be under 2.5 seconds. Converting images to WebP, using a CDN, and inlining critical CSS all help achieve this.
Code splitting ensures users only load JS for the page they're viewing. Lazy loading images is as simple as adding loading="lazy". Resource hints like preconnect and preload ensure critical resources load early.
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