What are some good code optimization methods?

Posted by esac on Stack Overflow See other posts from Stack Overflow or by esac
Published on 2009-05-21T22:28:07Z Indexed on 2010/05/21 10:40 UTC
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Filed under:

Performance

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language-agnostic

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optimization

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performance-tuning

I would like to understand good code optimization methods and methodology.

How do I keep from doing premature optimization if I am thinking about performance already.
How do I find the bottlenecks in my code?
How do I make sure that over time my program does not become any slower?
What are some common performance errors to avoid (e.g.; I know it is bad in some languages to return while inside the catch portion of a try{} catch{} block

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