Robert Collins added the comment:
Oh, I got a profile from the test case for my own interest.
6615 seconds ..
some highlights that jumped out at me
20001 0.127 0.000 6610.025 0.330 difflib.py:868(compare)
which means we're basically using ndiff, which is cubic rather than quadratic -
the same performance issue the html module had.
I think we'll probably make a better tradeoff by using unified_diff instead
which is quadratic.
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Added file: http://bugs.python.org/file37001/issue19217-profile.txt
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