90% savings is very easy if the system was built by a beginner. I helped a friend once who was starting and reduced his query by 99% of time, and thus quite a c

90% savings is very easy if the system was built by a beginner. I helped a friend once who was starting and reduced his query by 99% of time, and thus quite a chunk of money, by a couple of simple changes (IIRC avoiding a JOIN he was making that he didn't actually need and adding an index).