Performance anti patterns

A Q&A-article on Stackoverflow all programmers must read, game programmers and whatnot.

http://stackoverflow.com/questions/425612/performance-anti-patterns

The biggest performance anti-pattern I have come across is:

Not measuring performance before and after the changes.

Collecting performance data will show if a certain technique was successful or not. Not doing so will result in pretty useless activities, because someone has the “feeling” of increased performance when nothing at all has changed.

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