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Tue Jun 29 18:34:42 CEST 2010 · https://mail.python.org/pipermail/python-dev/2010-June/101201.html

On Tue, Jun 29, 2010 at 07:56:22AM -0700, Guido van Rossum wrote:
> Since you have such a great reproducible test case, could you point
> the profiler at it? (Perhaps on a reduced dataset... The profiler
> multiples your run time by some number between 2 and 10 IIRC.)

Let me underline Guido's suggestion.  Steve, I've done a lot of
mailbox.py stuff and can look at your problem, but off the top of my
head, my suspicion would be that I/O is the culprit, and a profile
could confirm that.  My thought is that mailbox.py is opening the file
in some reading mode that ends up doing a lot more processing on
Windows than on Unix because of universal newlines or something like
that.

--amk

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[Python-Dev] Mailbox module - timings and functionality changes