[issue13155] Optimize finding the max character width

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Without the patch:

python3.2 -m timeit 'x="é"+"x"*10000' 'x[1:]'
100000 loops, best of 3: 2.18 usec per loop
                                                                                     
python3.3 -m timeit 'x="é"+"x"*10000' 'x[1:]'
100000 loops, best of 3: 6.68 usec per loop

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13155>
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