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From: Eli Zaretskii <eliz@fencepost.gnu.org>
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Subject: Re: ediff-next-difference very slow
Date: Wed, 17 Apr 2002 13:11:19 -0400
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	     (message from Roland Winkler on Wed, 17 Apr 2002 17:14:27 +0200)
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> From: Roland Winkler <roland.winkler@physik.uni-erlangen.de>
> Date: Wed, 17 Apr 2002 17:14:27 +0200
> 
> On Wed Apr 17 2002 Eli Zaretskii wrote:
> > It seems that having many overlays in a buffer slows down Emacs quite
> > a bit.  Perhaps this problem is another manifestation of that?
> 
> This is something I do not understand: Is it sufficient here for
> slowing emacs down that one buffer of all the open buffers has many
> overlays?

I don't think this riddle is solved yet; please wait for Richard to
chime in, he was following this problem.

> The point is that the buffers involved in the ediff
> session are the same in a fresh emacs session and in an emacs
> session that is running for many days.

Yes, someone else reported a similar problem with RMAIL buffers:
after a while, RMAIL becomes painfully slow.