If you're doing a lot of work in C/C++/Rust consider using sccache to cache compilations. It's easy to set up and will save you a lot of time and a huge amount of power.
https://github.com/mozilla/sccache
As an example this is just a couple of hours of work on Firefox, it saved me from re-running the compiler almost 90% of the time.
@gabrielesvelto make sure to tell Flo if hé doesnt use it yet
@gabrielesvelto literally the first thing I did when I moved to Embark, been using it for 5 years now.