This is a good callout, although we probably won't be able to significantly improve the performance of Go compiled to WASM until WebAssembly evolves and introduces support for threads or stack switching so we can define goroutines based on those; right now the main reason Go compiled to WASM isn't in the ballpark of native perf is due to the stack switching emulation we have to do to get the cooperative scheduling of goroutines to work. We'll need WASM runtimes to offer more advanced primitives that we can rely on to implement those features of the Go language and produce much higher-quality code.