One interesting thing to me is that you don't have to write an entire app using only WebAssembly or JS. You can take the classic approach of benchmarking to fin

One interesting thing to me is that you don't have to write an entire app using only WebAssembly or JS. You can take the classic approach of benchmarking to find hotspots, and then optimizing those. Migrating these performance sensitive sections to more performant code can be a win.