Re: slow nnimap moves due do many SELECTs

[Michael Welsh Duggan <md5i@md5i.com>]

Lars Magne Ingebrigtsen <larsi@gnus.org> writes:

> Ted Zlatanov <tzz@lifelogs.com> writes:
>
>> Moving N articles results in:
>>
>> 09:00:37 190 SELECT "INBOX"
>> 09:00:37 191 UID FETCH 274385 BODY.PEEK[]
>> 09:00:37 192 UID COPY 274385 "INBOX.ding"
>> 09:00:37 193 UID STORE 274385 +FLAGS.SILENT (\Deleted)
>> 09:00:37 194 UID EXPUNGE 274385
>> 09:00:37 195 SELECT "INBOX.ding"
>> 09:00:37 196 UID SEARCH HEADER Message-Id "<87tylhhpie.fsf@lifelogs.com>"
>
> [...]
>
>> etc. for each article.  Can than be optimized to switch mailboxes only
>> once?
>
> Hm.  Well, the thing is that we need to select the group we moved to to
> find out what the article number we got was.  Because Gnus needs that to
> copy over the marks and other stuff.  So copying an article from group A
> to group B involves at least to SELECTs.

You may not need to copy over the marks.  The spec says: "The flags and
internal date of the message(s) SHOULD be preserved, and the Recent flag
SHOULD be set, in the copy."  If the SHOULD is bothersome, it would be
nice to have a per-server variable we can set if we know that that
server handles this correctly. 

-- 
Michael Welsh Duggan
(md5i@md5i.com)