“More performant” citation needed. Very well written Rust might be extremely fast, yes, but Rust is also a hard language to get right. Swift is far from a slow language and I would not be surprised if the average rust programmer barely if at all manages to beat out the average swift programmer in terms of speed. As for the amount of programmers interested, hard to tell, but given the sheer amount of Swift devs I’d not be surprised if there were quite a few interested ones and I am unconvinced Rust programmers are statistically more likely to be interested in Browser development.