[arxanas]

One thing I discovered while trying to improve my incremental Rust compilation time (https://blog.waleedkhan.name/rust-incremental-test-times/) was that there was a lot of time that seems to have been attributable to `cargo` itself (https://lobste.rs/s/ktyp2q/improving_incremental_test_times_...), rather than the compiler. It seems like a similar situation as reported in the article.