Node.js is famously single-threaded, but that doesn’t mean it can’t handle CPU-intensive tasks. Worker threads allow us to run JavaScript in parallel, offloading heavy computations without blocking the event loop. However, using them incorrectly can lead to crashes, memory leaks, and performance regressions instead of improvements.

In this talk, we’ll demystify worker threads and explore when and how to use them properly. We’ll cover the common pitfalls developers encounter, how to manage communication between threads efficiently, and best practices to keep your app stable and performant.

✅ When to use worker threads - and when they’re not the right tool
✅ How to efficiently send and receive data between threads
✅ The trade-offs between worker threads and child processes
✅ Common mistakes that cause performance issues - and how to avoid them

If you’ve ever wondered whether worker threads could help speed up your app but weren’t sure where to start, this session will give you a clear and practical roadmap to using them safely.