Summary
Web Workers are a powerful tool for bypassing JavaScript's single-threaded limitation. The core structure is letting the main thread focus on UI while offloading heavy computation to separate threads.
Key Takeaways:
- Consider Workers for CPU-intensive tasks taking over 100ms
- Optimize large data transfer with Transferable Objects
- Eliminate communication boilerplate with Comlink
- Workers can't access DOM, communicate only via messages
- Goal is improving user experience, not just performance
The CSV parsing problem ultimately boiled down to a UX question: "What do we show users while they wait?" Web Workers were one answer, and in real projects, they visibly reduced user drop-off rates. Technology is just a tool, but when used properly, it can transform the quality of experience—a lesson I've learned once again.