> I think that's the premature in premature optimization, when you spend time optimizing something you aren't sure will even survive a later point in the design

> I think that's the premature in premature optimization, when you spend time optimizing something you aren't sure will even survive a later point in the design stage. That's true enough, though it doesn't seem to be the original point, since the context refers to optimizing parts of the code that aren't taking most of the time. Which is a danger, but I think the danger is in wasting time on such optimizations, either up front or through increased complexity.