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From: Jan Vroonhof <vroonhof@math.ethz.ch>
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Subject: Re: Not running expiry when I exit a group
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Jan Vroonhof <vroonhof@math.ethz.ch> writes:

> as the the other ones. Why is it so slow anyway? Even under elisp a
> few thousand compares should be doable in a few secconds.

It is not slow because of the compares... (I implemented a dummy
nnmail-expirable-article-p that returns nil always and it is still slow)

1. It is slow because it looks
up each article by searching for it from (point-min).

I just did a

(progn
   (setq i 3000)
   (save-excursion
     (set-buffer bufje)
     (while (< 0 i)
       (setq i (+ i -1))
       (goto-char (point-min))
       (search-forward "X-Gnus-Article-Number: 3451"))))

where bufje is the nnfolder:xemacs-beta buffer and it took about as
long. (nnolder-request-expire-articles does about the same).
I think there is a lot of room for optimization here.

2. My articles in nnfolder:xemacs-beta are numbered 31xx - 3451... but
   Gnus does a
    gnus-request-expire-articles((594 595 596 597 598
   So it searches about 2500 times too many!.

There's some baaaadddd things going on here.