React Concurrent Features: Building Responsive UIs

Fri, 06 Dec 2024 00:00:00 +0900

React 18 introduced concurrent features that fundamentally change how rendering works. These features let React prepare multiple versions of the UI at once, interrupt work in progress, and prioritize urgent updates over non-urgent ones. The result is more responsive applications without giving up the declarative programming model that makes React productive.

Concurrency in React is not an all-or-nothing mode. Unlike the abandoned “Concurrent Mode” concept from earlier experimental builds, React 18+ makes concurrent features opt-in. You adopt them feature by feature, where they provide the most value. The underlying Fiber architecture makes this possible: React’s render phase can be paused and resumed, so the reconciler can switch between different units of work as priorities change.

Concurrent on Commentary of Takao

React Concurrent Features: Building Responsive UIs