Faster? I'm not sure about that. Maybe if you are doing a lot of talk between the compiled and JS runtime/DOM. But otherwise WASM has been much further developed in both Firefox and Chrome.

I don't think Chrome ever did an asm.js specific optimization.

It did, V8 added asm.js compilation to WASM in 2017 https://v8.dev/blog/v8-release-61#asm.js-is-now-validated-an...