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From: Simon Josefsson <jas@pdc.kth.se>
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Subject: Re: overview file access when spooling and nnml/nnimap performance
Date: 22 Sep 1999 19:08:37 +0200
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Hannu Koivisto <azure@iki.fi> writes:

> The primary reason why I was thinking about backend was the spooling
> phase.  That's the primary problem I'm seeing now -- it has slowed
> down a lot while my folders have grown larger and I don't think Gnus
> needs to do anything that would prevent scaling in this case.
> Perhaps I'm wrong, but this is what I'm trying to find out.

I don't know much about how the spooling phase works, but I would
assume it involves calculating (especially expanding/compacting) gnus
"ranges". And the gnus-range-* functions do very poorly when more
than, say, 10.000 articles are involved.

Try M-x elp-instrument-package RET gnus RET, fetch new mail, and look
at M-x elp-results RET, if gnus-range-* comes up at the top you've
confirmed my guess. If not, you should be able to figure out where all
the time is spent, no?