Testing on Fedora 40 x86_64.
Default dev profile:
Post cargo clean: cargo build 385.75s user 34.70s system 599% cpu 1:10.08 total
After touching main.rs: cargo build 3.91s user 1.23s system 99% cpu 5.151 total
With debug = "line-tables-only"
Post cargo clean: cargo build 353.69s user 34.42s system 619% cpu 1:02.62 total
After touching main.rs: cargo build 2.86s user 1.02s system 99% cpu 3.881 total