Thomas Lee added the comment:
My results aren't quite as dramatic as yours, but there does appear to be a
regression:
$ ./python -V
Python 2.7.3+
$ ./python -m timeit -s "s = 'b'*1000" "s.replace('b', 'a')"
100000 loops, best of 3: 16.5 usec per loop
$ ./python -V
Python 3.3.0rc3+
$ ./python -m timeit -s "s = 'b'*1000" "s.replace('b', 'a')"
10000 loops, best of 3: 22.7 usec per loop
----------
nosy: +thomaslee
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<http://bugs.python.org/issue16061>
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