Do you use Big-O complexity evaluation in the 'real world'?

Question

Recently in an interview I was asked several questions related to the Big-O of various algorithms that came up in the course of the technical questions. I don\'t think I di

Answer 1

I try to hold off optimizations until profiling data proves they are needed. Unless, of course, it is blatently obvious at design time that one algorithm will be more efficient than the other options (without adding too much complexity to the project).