>This page describes **experimental features that are not yet available in a stable release**. Don't rely on experimental builds of React in production apps. These features may change significantly and without a warning before they become a part of React.
>
>This documentation is aimed at early adopters and people who are curious. If you're new to React, don't worry about these features -- you don't need to learn them right now.
>This documentation is aimed at early adopters and people who are curious. **If you're new to React, don't worry about these features** -- you don't need to learn them right now.
</div>
- [Installation](#installation)
- [Who Is This Experimental Release For?](#who-is-this-experimental-release-for)
>This page describes **experimental features that are [not yet available](/docs/concurrent-mode-adoption.html) in a stable release**. Don't rely on experimental builds of React in production apps. These features may change significantly and without a warning before they become a part of React.
>
>This documentation is aimed at early adopters and people who are curious. If you're new to React, don't worry about these features -- you don't need to learn them right now.
>This documentation is aimed at early adopters and people who are curious. **If you're new to React, don't worry about these features** -- you don't need to learn them right now.
</div>
This page provides a theoretical overview of Concurrent Mode. **For a more practical introduction, you might want to check out the next sections:**
>This page describes **experimental features that are [not yet available](/docs/concurrent-mode-adoption.html) in a stable release**. Don't rely on experimental builds of React in production apps. These features may change significantly and without a warning before they become a part of React.
>
>This documentation is aimed at early adopters and people who are curious. If you're new to React, don't worry about these features -- you don't need to learn them right now.
>This documentation is aimed at early adopters and people who are curious. **If you're new to React, don't worry about these features** -- you don't need to learn them right now. For example, if you're looking for a data fetching tutorial that works today, read [this article](https://www.robinwieruch.de/react-hooks-fetch-data/) instead.
</div>
Usually, when we update the state, we expect to see changes on the screen immediately. This makes sense because we want to keep our app responsive to user input. However, there are cases where we might prefer to **defer an update from appearing on the screen**.
>This page describes **experimental features that are [not yet available](/docs/concurrent-mode-adoption.html) in a stable release**. Don't rely on experimental builds of React in production apps. These features may change significantly and without a warning before they become a part of React.
>
>This documentation is aimed at early adopters and people who are curious. If you're new to React, don't worry about these features -- you don't need to learn them right now.
>This documentation is aimed at early adopters and people who are curious. **If you're new to React, don't worry about these features** -- you don't need to learn them right now.
</div>
This page is an API reference for the React [Concurrent Mode](/docs/concurrent-mode-intro.html). If you're looking for a guided introduction instead, check out [Concurrent UI Patterns](/docs/concurrent-mode-patterns.html).
>This page describes **experimental features that are [not yet available](/docs/concurrent-mode-adoption.html) in a stable release**. Don't rely on experimental builds of React in production apps. These features may change significantly and without a warning before they become a part of React.
>
>This documentation is aimed at early adopters and people who are curious. If you're new to React, don't worry about these features -- you don't need to learn them right now.
>This documentation is aimed at early adopters and people who are curious. **If you're new to React, don't worry about these features** -- you don't need to learn them right now. For example, if you're looking for a data fetching tutorial that works today, read [this article](https://www.robinwieruch.de/react-hooks-fetch-data/) instead.
</div>
React 16.6 added a `<Suspense>` component that lets you "wait" for some code to load and declaratively specify a loading state (like a spinner) while we're waiting:
Dan
5 years ago