[ncruces]

That's going to depend on what you mean for "original Wasm performance".

What were you using to run Wasm instead of this?

I can compare with wazero, which I was previously using, and say performance stayed mostly in the same ballpark. Things that crossed the Go-to-Wasm boundary very often became much faster, things that stayed mostly in Wasm became slightly slower, as the wazero compiler is pretty good.

wasm2go also does not support SIMD, so if your Wasm module uses/benefits from SIMD, you'll notice.