The React team is already working on features for a future version of React.

One of those features is the <Activity> component. It allows to render to the virtual DOM using an asynchronous "hidden" mode, that can instantaneously commit to the real DOM when the mode switches to "visible".

Another nice feature is the <ViewTransition>, allowing React to use the new "View Transitions API" that is available on most modern browsers (except Firefox). These animations are elegant, fluid, and even work during page transitions.

Even though these features are not available in the current version of React, they are available in the "experimental" version. Come with us and explore a few demos. This is going to be fun!

Writing fluid user interfaces becomes more and more challenging as the application complexity increases. Also, in a world with a wide variety of network connections, any user can have a slow experience, and apps that delight users on fast connections can barely be usable on slow ones. Leveraging real-world case studies from small, medium, and enterprise-scale companies, in this workshop, we will:

↝ Have an in-depth overview of the important concepts behind reconciliation and React Fiber and and go through a few magic words we hear a lot, like coroutines, generators, and more.

↝ Explore how proper scheduling can improve your app’s experience by diving into some concurrent React features, understanding their rationales, and how they work under the hood.

↝ Discuss a wide range of performance APIs native to the Web Platform itself.

↝ See how to measure responsiveness, and reliably identify culprits for bad experiences.

↝ Discuss how to apply modern techniques to legacy codebases, via code generation, polyfilling, and many other tips and tricks for large platforms targeting emerging markets.

A practical talk on we handled a concurrency use-case in a React application that we had (auth token refresh / duplicate requests) and how we made it using the library async-mutex coupled with RTK query.

React has changed a lot in the last year: React 19, 19.1 and now 19.2 brought a stable React Compiler, new hooks like useEffectEvent, the <Activity /> API, and better SSR primitives such as Partial Pre-rendering. And more

In this talk we’ll take a demo React app that’s full of effects, memoization and “old school” patterns, and modernize it step by step