Comment by flohofwoe

> It's not fast.

My emulators here have roughly the same performance as the same code compiled as native executable (e.g. within around 5%) - this is mostly integer bit twiddling code. Unless you hand-optimize your code beyond what portable C provides (like manually tuned SIMD intrinsics), WASM code pretty much runs at native speed these days:

https://floooh.github.io/tiny8bit/