[josephg]

I'm curious about this too.

I hand-wrote a perlin noise generation function in asmjs when that was the future. Then I called my noise function from a loop in javascript to paint an image (1 call per pixel - about 1M calls). Running the perlin noise code with the asmjs engine in Firefox turned out to be a bit slower than running all the code through FF's regular javascript engine. The asmjs code ran fast, but the FFI overhead at the boundary between JS and asmjs made the system slower overall.

Given how easy it looks, I might try the same experiment with Rust & WASM to see where we're at. That said, this is the sort of thing which can definitely be improved over time.

[Crespyl]

These days it's probably possible to use a buffer in the asmjs/WASM side and generate the image data there, only exporting back to the JS side after the job is complete. That should significantly cut down on the overhead.