[stockhorn]

I've also tried to optimize c++ compile times on large projects a few times. I never got IWYU working properly and I always hated the fact that I still have to care about header files at all. Then I switched to doing rust full time, which made all the fiddling with header files obsolete. This felt amazing. But now I'm facing the same problem, slow compile times :). Only this time I have to rely on the compiler team to make the improvements and I cant do much on my side AFAIK.

[Nereuxofficial]

Well that's not quite true. You can do a few things: 1. Reduce dependencies and features of dependencies 2. Use a faster linker like mold 3. Use a faster compiler backend like cranelift(if possible) 4. Use the parallel compiler frontend(again if using nightly is possible) 5. Use sccache to cache dependencies But i do get what you mean. Especially in CI the build times are often long

[fanf2]

Split up crates so your compilation units are smaller.