[issue16061] performance regression in string replace for 3.3

[Thomas Lee]

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

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nosy: +thomaslee

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<http://bugs.python.org/issue16061>
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