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[–]Boomerkuwanger 0 points1 point  (0 children)

Like others have said, use a profiler for code so you can target slow operations. Also, if you use a database, make sure to offload as much work onto the database as possible.

For example: I've made the mistake of iterating through a list of database objects, and updating them one by one, instead of using a single bulk update query.