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.

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

In this talk, I'll uncover some tricks and hacks in React that I learned while maintaining a micro-library (2KB Router). We'll discuss performance and size optimizations, as well as the importance of keeping object references stable when passing them down as props to React components.

I'd like to cover the non-standard use of the useState hook, cloneElement API for component composition, the useSyncExternalStore hook introduced in React 18, and its caveats; as well as lesser-known non-standard hooks such as useEvent and more. To demonstrate these tricks, we'll built a fake multiplayer client component.

React 19.2 just landed, and it’s not just another version bump — it’s a real upgrade for how we build apps. From smoother background updates with Activity, cleaner side effects with useEffectEvent, to smarter server-side handling with cacheSignal, React 19.2 is all about making your code faster, cleaner, and easier to understand.

In this talk, we’ll walk through the new features, what problems they solve, and how you can use them right away in your projects. We’ll also look at Performance Tracks in Chrome DevTools — a new way to actually see how your app performs under the hood.

Whether you’re a beginner or an experienced React dev, you’ll walk away knowing how to use these tools to write less buggy code, improve app speed, and enjoy coding with React a little more.