Yeah, I'd be surprised. I'm sure there are improvements to be made out there (e.g. maybe the sandbox could be faster) but the crazy leaps we've seen in JS perfo

Yeah, I'd be surprised. I'm sure there are improvements to be made out there (e.g. maybe the sandbox could be faster) but the crazy leaps we've seen in JS performance are primarily because the complexity in the language makes for a very complex implementation with plenty of inefficiencies. By comparison WASM is already pretty close to the metal.