This causes **all pages** that do not use [`getStaticProps`](/docs/pages/building-your-application/data-fetching/get-static-props) into Server-side Rendering (at runtime) and disables [Automatic Static Optimization](/docs/pages/building-your-application/rendering/automatic-static-optimization).
Verify if you need to use `getInitialProps` in `pages/_app`. There are some valid use cases for this, but it's often better to use `getInitialProps` in individual pages.
- Check for any [higher-order components](https://reactjs.org/docs/higher-order-components.html) that may have added `getInitialProps` to your [Custom `<App>`](/docs/pages/building-your-application/routing/custom-app).
- If you previously copied the [Custom `<App>`](/docs/pages/building-your-application/routing/custom-app) example from the old docs, you can remove `getInitialProps`.