STINNER Victor added the comment:

I created a repository. I will work there and make some experiment. It would 
help to have a better idea of the concrete performance. When I will have a 
better view of all requires changes to get best performances everywhere, I will 
start a discussion to see which parts are worth it or not. In my latest 
microbenchmarks, functions calls (C/Python, mixed) are between 8% and 40% 
faster. I'm now running the CPython benchmark suite.

----------
title: Add a new _PyObject_FastCall() function which avoids the creation of a 
tuple or dict for arguments -> [WIP] Add a new _PyObject_FastCall() function 
which avoids the creation of a tuple or dict for arguments

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26814>
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