INADA Naoki added the comment:

> Maybe it's the expensive price of creating a temporary dictionary?

Please see the patch on issue29295.
PyDict_GetItemString() is bad part, too.
It's create str object, calc hash, lookup dict, and dealloc the str object.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29259>
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