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---
title: onDemandEntries
description: Configure how Next.js will dispose and keep in memory pages created in development.
---
{/* The content of this doc is shared between the app and pages router. You can use the `<PagesOnly>Content</PagesOnly>` component to add content that is specific to the Pages Router. Any shared content should not be wrapped in a component. */}
Next.js exposes some options that give you some control over how the server will dispose or keep in memory built pages in development.
To change the defaults, open `next.config.js` and add the `onDemandEntries` config:
```js filename="next.config.js"
module.exports = {
onDemandEntries: {
// period (in ms) where the server will keep pages in the buffer
maxInactiveAge: 25 * 1000,
// number of pages that should be kept simultaneously without being disposed
pagesBufferLength: 2,
},
}
```
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