Uploaded September 2025 | Updated September 2026, 10 hours ago

---

React Native is moving beyond single-threaded JavaScript.

At React Universe Conf 2025, Tomasz Żelawski (Software Engineer at Software Mansion) introduces react-native-worklets, a library that enables developers to push JavaScript to its multithreading limits. Worklets unlock new levels of performance by allowing concurrent execution outside the main JS thread, reducing bottlenecks and enabling smoother, more responsive apps.

Skip the intro ⏩ 0:39

🔹 Why single-threaded JavaScript is limiting in React Native
🔹 How react-native-worklets enables concurrent execution across multiple threads
🔹 Practical examples of using worklets everywhere, from UI interactions to heavy computations
🔹 Internals and implementation quirks developers should know before adopting worklets
🔹 The future of concurrency in React Native and how worklets fit alongside the new architecture

This talk is a deep dive into the mechanics of concurrent JavaScript in React Native and why worklets are a game-changer for performance.

See you at another React Universe Conf 🎟️ clstk.com/4peJI63
Follow React Universe Conf on X to stay up to date 🐦 https://x.com/reactuniverse_
Check out Callstack content 📚 clstk.com/4886eHI