When you have written lots of code, you remember some of the things you had to optimize in the past, and when you find yourself in a similar situation you're te

When you have written lots of code, you remember some of the things you had to optimize in the past, and when you find yourself in a similar situation you're tempted to just do it now so that you don't have to do it later. The fact that sometimes you're right just reinforces this behavior, but when you get it wrong it tends to blow up in your face.