Guide to Concurrency in React 18: How and Why

Guide to concurrency, CPU- and IO-bound components, and other interesting stuff. Finally, learn wtf deferred value is.

Concurrency is one of the big things we got with the release of React 18. As this feature is completely opt-in and React 18 is backward-compatible with previous versions, you might not even notice the new features. If you'd like to catch up and finally get to know what concurrency is, how it works and how it could improve your app — continue reading.

If there is already content displaying inside the Suspense boundary, rather than handling suspension as usual and showing fallback, React will pause rendering and switch to other tasks until the promise resolves, and then commit a complete subtree with new content. This way, React avoids hiding already-present content. If a component suspends during the first render, fallback will be shown.

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