Bundle analyzer, RSC, and dynamic imports.
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How do you analyze and reduce bundle size in Next.js?
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01
Understand the problem
nextjsbundle-sizeperformanceoptimization
02
Attempt it yourself
Sketch your approach before reading the solution — that's what interviews test.
Nudge consolestandby
Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.
03
Study the solution
Use @next/bundle-analyzer to visualize bundles, then shrink them: keep components as Server Components (zero client JS), lazy-load heavy client code with next/dynamic, avoid large dependencies/barrel imports, and move logic server-side. Check the build output's per-route JS sizes.
Solution ready — 2 min read
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04
Read the code
Enable the analyzer + avoid barrel imports
// next.config.js
const withAnalyzer = require('@next/bundle-analyzer')({ enabled: process.env.ANALYZE === 'true' });
module.exports = withAnalyzer({ /* ... */ });
// run: ANALYZE=true next build
// ❌ pulls the whole library
import { debounce } from 'lodash';
// ✅ imports only what you need
import debounce from 'lodash/debounce';05
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