Most people complaining about Rust being slow have never worked on anything close to a production app written in Rust.
By the way, for most apps, rhe difference from an app we'd write in class is not as nearly as big as you'd expect: most of the code lies within dependencies anyway, and you need roughly the same amount of them in both cases.
Of course there are exceptions, apps that are tens of millions of LoCs exist, but it's not the majority.
(And they tend to be naturally split in multiple crates, which is the default workaround if a rust project takes too much time to compile).
By the way, for most apps, rhe difference from an app we'd write in class is not as nearly as big as you'd expect: most of the code lies within dependencies anyway, and you need roughly the same amount of them in both cases.
Of course there are exceptions, apps that are tens of millions of LoCs exist, but it's not the majority.
(And they tend to be naturally split in multiple crates, which is the default workaround if a rust project takes too much time to compile).