My Experience Exploring WebAssembly for High-Performance Browser Apps
Taking browser performance to native levels. Why I started experimenting with WebAssembly and Rust for computationally heavy web features.
The starting point
JavaScript is incredibly versatile, but it has its limits when it comes to intense, CPU-bound tasks in the browser. Recently, I hit a performance wall while building an image processing feature. That's when I decided it was time to get my hands dirty with WebAssembly (Wasm).
What I learned
I chose to write the performance-critical parts in Rust and compiled them to Wasm. Compiling a completely entirely different language to run alongside JavaScript inside the browser feels somewhat like magic. The interoperability setup took some trial and error, specifically figuring out how to efficiently pass complex data structures between JS and Wasm memory. However, once it clicked, the performance gains were undeniable. Image processing tasks that used to lock up the main thread for several seconds were suddenly resolving in under a second. Getting into WebAssembly has completely expanded my view on what is possible within a web browser.