I've gotten 400(+)x speedups by going from python to python. Original program was 50min in python, 1 min pypy After figuring out some inefficiencies that were

I've gotten 400(+)x speedups by going from python to python. Original program was 50min in python, 1 min pypy After figuring out some inefficiencies that were O(Nsquared), it was 3 seconds in python This was timing for a case where N was much larger than my normal cases, where run time had been a couple seconds with the original version and optimization didn't really matter.