I think its mostly a false dichotomy * I think there are times when slower performance is an acceptable cost * we should significantly slow down compile time f

I think its mostly a false dichotomy * I think there are times when slower performance is an acceptable cost * we should significantly slow down compile time for any non negligeable win of runtime performance BUT this slow down should only be incurred in optimised builds (>= 01) and have no side effect on debug compile time which should be fast and it almost does not matter if they get slower at runtime.