bundle-analysis

Reduce JavaScript bundle size by setting up a bundle analyzer tool, then apply code-splitting, tree-shaking, and dynamic imports to eliminate unused code and defer non-critical components. Next.js bundle analyzer visualizes chunk composition so you can target the largest contributors to load time.

Large bundles over 500KB and unoptimized vendor chunks increase First Contentful Paint and Time to Interactive. Fix by removing duplicate dependencies, implementing selective dependency imports, and splitting code so only required JavaScript loads per route.

Yes. Next.js supports dynamic imports for lazy-loading components and automatic code-splitting by route. This defers bundle delivery, reducing initial load and enabling faster Time to Interactive on first page render.

Use a bundle analyzer to inspect your client and server reports, which reveal duplicate packages and vendor chunk bloat. Once identified, apply selective imports and tree-shaking configuration to eliminate redundancy and shrink bundle output.

Set up bundling analysis tooling with environment configuration, analyze route and vendor chunk composition, then implement tree-shaking, code-splitting, and dynamic imports. Target specific metrics like bundle size thresholds to achieve faster page delivery.

Bundle analysis applies to general web applications beyond Next.js. Any application with large bundles, slow initial loads, or high First Contentful Paint can benefit from setting up bundling analysis tooling and applying code-splitting and tree-shaking patterns.