Which is slow and heavy in Rust. All languages have that but faster (and simpler due to no lifetimes).

cargo check is fast. It's only slow when the build goes through (barring extreme use of compile-time proc macros, which is rare and crate-specific).

i mean as a first order approximation context (the key resource that seems to affect quality) doesn't depend on real compilation speed, presumably the agent is suspended and not burning context while waiting for compliation