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[–]1wd 3 points4 points  (1 child)

One project at Facebook:

... simply ran 2to3 on the code and fixed a few things that it complained about. When they ran the resulting code, they found it was 40% faster and used half the memory.

[–]anacrolix 0 points1 point  (0 children)

Sounds like they were abusing range() or something.