---
title: optimizePackageImports
description: API Reference for optimizePackageImports Next.js Config Option
---

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Some packages can export hundreds or thousands of modules, which can cause performance issues in development and production.

Adding a package to `experimental.optimizePackageImports` will only load the modules you are actually using, while still giving you the convenience of writing import statements with many named exports.

```js filename="next.config.js"
module.exports = {
  experimental: {
    optimizePackageImports: ['package-name'],
  },
}
```

The following libraries are optimized by default:

- `lucide-react`
- `date-fns`
- `lodash-es`
- `ramda`
- `antd`
- `react-bootstrap`
- `ahooks`
- `@ant-design/icons`
- `@headlessui/react`
- `@headlessui-float/react`
- `@heroicons/react/20/solid`
- `@heroicons/react/24/solid`
- `@heroicons/react/24/outline`
- `@visx/visx`
- `@tremor/react`
- `rxjs`
- `@mui/material`
- `@mui/icons-material`
- `recharts`
- `react-use`
- `@material-ui/core`
- `@material-ui/icons`
- `@tabler/icons-react`
- `mui-core`
- `react-icons/*`
- `effect`
- `@effect/*`