STINNER Victor added the comment:

Without the patch:

$ ./python -m timeit "import sys; modname='operator'" "__import__(modname); del 
sys.modules[modname]" 
1000 loops, best of 3: 289 usec per loop

$ ./python -m timeit "import sys; modname='_operator'" "__import__(modname); 
del sys.modules[modname]" 
10000 loops, best of 3: 21.4 usec per loop


"import operator" is 12.7x faster (289 usec => 22.7 usec) with 
builtin_operator.patch.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19229>
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