[pkolaczk]

Depends on the application. In area of compilers, databases, CAD, game engines, simulation, distributed analytics, machine learning the only code that isn't on the critical path is some configuration / control plane / UI - which is minority of the code.

[lmm]

Certainly not in the entirety of those areas. I've worked in a couple of them and functionality was a higher priority than performance and we picked our tools accordingly.