By combining WebAssembly with Web Workers, developers can offload heavy computations to background threads to prevent bottlenecks.

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WebAssembly combined with Web Workers prevents UI freezes by offloading heavy computations to background threads. The tutorial demonstrates building a Fibonacci calculator using C compiled to WebAssembly via Emscripten, running calculations in a Web Worker to keep the main thread responsive. While JavaScript is faster for small calculations (below 25), WebAssembly significantly outperforms it for intensive tasks. The key benefit is maintaining UI responsiveness during heavy processing, as the worker runs independently of the main thread that handles user interactions.

How WebAssembly and Web Workers prevent UI freezes