Performance anti patterns

Question

I am currently working for a client who are petrified of changing lousy un-testable and un-maintainable code because of \"performance reasons\". It is clear t

Answer 1

Once I had a former client call me asking for any advice I had on speeding up their apps.

He seemed to expect me to say things like "check X, then check Y, then check Z", in other words, to provide expert guesses.

I replied that you have to diagnose the problem. My guesses might be wrong less often than someone else's, but they would still be wrong, and therefore disappointing.

I don't think he understood.