Serhiy Storchaka added the comment:

Please port your code to Python 3.3 and compare with it. Python 3.3 
implementation of str.join() already more than twice faster then Python 2.7. 
Maybe your optimization will have no effect.

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nosy: +storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15522>
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