How to Fix Large Bundle Size in AI-Built Apps

Your production JavaScript bundle is bloated, causing slow page loads and poor Core Web Vitals. AI code generators often import entire libraries instead of tree-shakeable subpaths.

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Error messages you might see

Warning: Large bundle size detected. Consider using dynamic imports.
Error: JavaScript heap out of memory during build

Why this happens in AI-generated code

1

Barrel file imports

Importing from package index files pulls in the entire library instead of individual modules.

2

Missing code splitting

AI-generated code rarely adds dynamic imports or lazy loading, shipping everything in one chunk.

3

Unoptimized dependencies

Heavy libraries like moment.js or lodash are imported wholesale when lighter alternatives exist.

How to fix it

1

Use subpath imports

Replace `import { debounce } from 'lodash'` with `import debounce from 'lodash/debounce'` to enable tree shaking.

2

Add dynamic imports

Use `next/dynamic` or `React.lazy()` to code-split heavy components that aren't needed on initial render.

3

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Related technologies

Next.jsReactJavaScript

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Frequently asked questions

How do I analyze my bundle size?

Use `@next/bundle-analyzer` or `source-map-explorer` to visualize what's contributing to your bundle.

What is a good bundle size target?

Aim for under 200KB of compressed JavaScript on initial load. Anything above 500KB will noticeably hurt performance.

Related resources

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