I would like just to add that sometimes "premature optimization" is confused with "performance decoration". Performance decoration is process in which you make

I would like just to add that sometimes "premature optimization" is confused with "performance decoration". Performance decoration is process in which you make software to look fast but without any positive impact on actual delivered performance. Also, there are two ways to make software go faster: do what you’re doing quicker or make it do less stuff. It is nearly always better to go "do less stuff" path.