[throwupaway1138]

Of course it is, at least if the optimized compiler is compiled with an optimized compiler, but also generally fast compilation is optimal.

[wlievens]

Fast compilation is a worth goal, but it's not fundamentally different from optimizing other kinds of programs: it involves good selection of data structures and algorithms, smart caching, that sort of stuff.

Compiler optimization (in the sense of optimizing the emitted code) is a research area of its own with millions of man hours invested.