The optimisation passes are expensive (not the largest source of compile time duration though).
Debug mode is designed to build as-fast-as-possible while still being correct, so that you can run your binary (with debug symbols) ASAP.
Overflow checks are present even in release mode, and some write-ups seem to indicate they have less overhead than you’d think.
Rust lets your configure your cargo configs to apply some optimisation passes even in debug, if you wish. There’s also a config to have your dependencies optimised (even in debug) if you want. The Bevy tutorial walks through doing this, as a concrete example.
That's not right, Rust only checks for overflow in release mode for numbers where its value is known at compile time. In debug mode all operations are checked for overflow.
Debug mode is designed to build as-fast-as-possible while still being correct, so that you can run your binary (with debug symbols) ASAP.
Overflow checks are present even in release mode, and some write-ups seem to indicate they have less overhead than you’d think.
Rust lets your configure your cargo configs to apply some optimisation passes even in debug, if you wish. There’s also a config to have your dependencies optimised (even in debug) if you want. The Bevy tutorial walks through doing this, as a concrete example.