[Akonadi] [Bug 334280] IMAP Synchronisation with GMAIL takes 13 minutes to complete !!

[Raymond Wooninck]

https://bugs.kde.org/show_bug.cgi?id=334280

--- Comment #10 from Raymond Wooninck <tittiatcoke at gmail.com> ---
(In reply to comment #9)
> It means UID's 257301 to 257400 are fetched which only correlates to the
> number of messages that ever have been in the folder (not to the amount you
> currently have).

So the number of flags that are going to be retrieved is only increasing with
time ?  I would have expected that the IMAP resource would not start retrieving
flags for messages that are no longer existing. Because at this moment I see
that the fetching starts with number 1 to 100 and then moves up to 100 to 200,
etc. So in the above example 257400 flags are trying to be fetched despite that
I have only maybe 100 messages in that particular folder. Which is quite an
overkill, in my opinion. 

I am currently trying to increase the batchsizes, but what I have noticed is
that the main issue comes from those high-volume folders where the fetching
starts from 1 and goes up to 257400 (regardless of how many emails are actually
in that folder (local and server). So it seems that Akonadi is just keeping the
latest message number and the IMAP resource will always start from 1. In case
of an empty folder, this could mean that the IMAP resource is spending 1 or
more minutes on trying to retrieve thousands of non-existing flags. I am sure
that there must be a better way to retrieve only the flags for existing
messages.

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