Stylo was attempted in C++ twice. Both times it was too buggy and had to be thrown out.

The third time, they used Rust. And it worked.

Most of recent Firefox performance come from parelelization in servo.

Mozilla research said rush enabled them doing safe multuthreading.

Well, it got faster because of Servo, which is written in Rust, so not completely unrelated, but yes, it did not get fast because of Rust the language.

I wonder why people make such bold wrong claims.

I think in this case it’s probably because the person in question is simply mistaken. The other possibility is that they are some kind of Rust evangelist and they are actively trying to deceive people. I doubt it. Could we please approach each other with the benefit of the doubt? Could we please gently, constructively correct errors? I see no need to be so aggressive, especially in our current social/political climate.

What current social/political climate? Moreover, the problem is that he claimed without research. And this is what bothers me. How can people be certain of something they have never seen confirmed anywhere.