Which might or might not be a good idea. When I'm writing code at my desk the faster it builds the better. I just need my unit tests to finish and they are small. When it the same code running on my embedded system with lots of data being thrown at it in real time and the cpu load is near (sometimes over) 100% I'll take every optimization of the final code I can get no matter how long it takes to build.

It would be nice if a gcc replacement compiler made speed of building code the goal. I'll even accept speed of building the compiler after it was compiled with gcc (clang, msvc...) as the benchmark if that is faster.