We do have experience, my C++ projects compile much faster than their rewrite in Rust.

On common laptops that you buy at the shopping mall, not compiler rigs.

I am not doing nothing special, other than all my third party artifacts are binary dependencies, not overusing templates, incremental compilation and incremental linking.

Cargo currently doesn't do binary dependencies, so already here I have to wait for the world to compile.

And while incremental compiling is already supported, lld still isn't supported on stable.

Plus I do have experience using other AOT compiled languages with modules support, since back in the day.

So we know what are talking about, and plenty of people on Rust team are quite aware of the problem, however not every can be fixed at the same time.