There have been significant (if not earth shattering) improvements in the compiler itself. But for me at least, the bigger change has been from better hardware.

There have been significant (if not earth shattering) improvements in the compiler itself. But for me at least, the bigger change has been from better hardware. I now have a processor (Apple M1 Pro) that's 10x (multi core) / 2x (single core) faster than the one I had when I first started programming using Rust (intel dual core processor in a 2015 MBP) and that seems to have translated almost perfectly into faster compile times.