Christian Heimes added the comment:

Giovanni, why do you think that hashing of unicode strings is slower than byte 
strings? 

First of all ASCII only unicode strings are packed and use just one byte per 
char. CPython's FNV implementation processes one element in each cycle, that is 
one byte for bytes and ASCII unicode, two bytes for UCS-2 and four bytes for 
UCS-4. Bytes and UCS-4 strings require the same amount of CPU instructions.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14621>
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