nextjs-optimization
Optimize images, fonts, scripts, and metadata for Next.js performance and Core Web Vitals. Use when configuring next/image for LCP, next/font for zero layout shift, next/script loading strategies, or generateMetadata for SEO.
What this skill does
# Optimization ## **Priority: P1 (HIGH)** Core optimization primitives provided by Next.js. **Monitor First, Optimize Later.** ## Monitoring (Core Web Vitals) - **LCP** (Largest Contentful Paint): Target < 2.5s. - **CLS** (Cumulative Layout Shift): Target < 0.1. - **INP** (Interaction to Next Paint): Target < 200ms. - **Tools**: Chrome DevTools "Performance" tab, `next/speed-insights`, `React Profiler`. ## Images Always use `next/image` to prevent CLS and enable automatic optimization: See [implementation examples](references/example.md) ## Fonts Use `next/font` for zero layout shift — self-hosts fonts and adds `font-display: swap`: See [implementation examples](references/example.md) ## Metadata (SEO) See [implementation examples](references/example.md) ## Scripts Use `next/script` with appropriate loading strategies: - `beforeInteractive`: Critical scripts (polyfills). - `afterInteractive`: Analytics (Google Analytics). - `lazyOnload`: Chat widgets, social embeds. ## Bundle & Components - Analyze with `@next/bundle-analyzer`. Prune heavy libraries; use ESM-tree-shakable dependencies. - Use `dynamic` imports with `Suspense` for large components not needed at initial render. - Enable `ppr: true` (Partial Prerendering) in Next.js 15+ for static shell + dynamic islands. ## Anti-Patterns - **No `<img>` tag**: Use `next/image` to prevent CLS and enable automatic optimization. - **No Google Fonts CDN link**: Use `next/font` to self-host and eliminate layout shift. - **No metadata in `_document.tsx`**: Use `export const metadata` or `generateMetadata()`. - **No 3rd-party scripts in `<head>`**: Use `next/script` with appropriate `strategy`.
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