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From: Nicolas Kowalski <Nicolas.Kowalski@imag.fr>
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Subject: Re: nnimap slow for message copy
Date: Fri, 26 Apr 2002 20:07:15 +0200
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In-Reply-To: <Pine.LNX.4.44.0204261922330.20589-100000@yxa.extundo.com> (Simon
 Josefsson's message of "Fri, 26 Apr 2002 19:23:46 +0200 (CEST)")
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Simon Josefsson <jas@extundo.com> writes:

> The problem is that the Gnus backend interface doesn't use COPY when 
> copying something, I think, so it ends up using fetch+store.  Of course, 
> the nnimap backend could detect this situation and use COPY instead. (As 
> it does when moving messages, I think.)

Hm, reading nnimap.el (line 1294), I see :

(deffoo nnimap-request-accept-article (group &optional server last)
  (when (nnimap-possibly-change-server server)
    (let (uid)
      (if (setq uid
		(if (string= nnimap-current-server nnimap-current-move-server)
		  ;; moving article within same server, speed it up...
		    (and (nnimap-possibly-change-group
			  nnimap-current-move-group)
			 (imap-message-copy (number-to-string
					     nnimap-current-move-article)
					    group 'dontcreate nil
					    nnimap-server-buffer))


So the optimization already exists...I simply do not understand what
this function is supposed to do, nor how to use it with a
group-to-group copy.