> Now I attach the patch.

Your first patch for Python 2.5 was interesting, and looked close to the 
python 2.6 version. But your second patch (for 2.6) contains only 
micro-optimisations:
 - inline the one-line clear_cache() function
 - replace "scheme, url = ..." assignation (used for scheme different 
   than http) by classic assignation (url = ...)

Your benchmark numbers are difficult to read, but I can't see impressive 
results (I guess it's smaller than 10%, maybe 5%).