Los Angeles, CA
Low-level optimization in image processing algorithms.
It is the antithesis or nemesis of the so-called 80-20 rule. I should say it's a balloon-popping rule: You can't pop a balloon twice.
Say, if there are 8 balloons, then pop each one of them. Once a balloon is popped what is left is a tiny rubber shred. Pop the next one.
To achieve, say, a 5/8 (62.5%) speedup, one will have to pop 5 of the 8 balloons, and so on.