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From: Justin Sheehy <dworkin@ccs.neu.edu>
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Subject: Re: Gnus and NoCeM.
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Dan Christensen <jdc@jhu.edu> writes:

> I've always wondered how hard it would be to add .overview files to
> the nnfolder backend.  So, how hard would it be?

It is not that it would be hard, but that it wouldn't buy you much of
anything.  Sure, group entry speed would increase a lot... until you
selected an article.  Then the slowdown that usually happens when
entering an nnfolder group would have to happen.

The .overview file doesn't let you get around the fact that with
nnfolder you must read and parse a file that grows with the number of
articles in the group.

There are conceivable ways that one might make it a bit faster, but
certainly just adding .overview files wouldn't get around the thing
that makes nnfolder slow.

-Justin