It's a pretty bad benchmark. I don't think there are any conclusions about WASM, ASM.js, or JavaScript that we can glean from this. All we can get is "this person's translation process is not very good."
All "this person's translation process" seems to be is selecting different compile targets in the official Rust compiler and then comparing the performance of each. Maybe some of those targets' optimisation is less mature than others, but the basic benchmark doesn't seem unreasonable to me.
My pointt was, given even the ASM.js version is slower than the vanilla JS version, it's a pretty good sniff test that the problem is in the Rust compiler and not the browser.
