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> However, the original question remains - on the 100MB file also, although
> in 2.7 readinto is 35% faster than readandcopy(), on 3.2 it's about the
> same speed (even a few % slower). That said, I now observe with Python 3.3
> the same speed as with 2.7, including the readinto() speedup - so it
> appears that the readinto() regression has been solved in 3.3? Any clue
> about where it happened (i.e. which bug/changeset)?

It would probably be http://hg.python.org/cpython/rev/a1d77c6f4ec1/