[Bug 150712] New: KMail takes ages to synchonize large IMAP folders that contain no or few changes

[Jens B.Benecke]

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http://bugs.kde.org/show_bug.cgi?id=150712         
           Summary: KMail takes ages to synchonize large IMAP folders that
                    contain no or few changes
           Product: kmail
           Version: 1.9.6
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs kde org
        ReportedBy: jens-bugs.kde.org spamfreemail de


Version:           1.9.6 (using KDE 3.5.6, Kubuntu (feisty) 4:3.5.6-0ubuntu14.1)
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.20-16-generic

Hi,

I use KMail with dimap and imap (tried both). I also use Apple Mail via IMAP.

I have about 2.5GB of mails distributed throughout ~ 50 folders on my IMAP account. However, only a few of them have new content when fetching new mails. Apple Mail runs through all folders in about 30 seconds. KMail stalls at big folders (at 25%) although they contain no new messages and do not need to be updated.

For example, a mailing list folder with close to 18'000 messages will stall KMail up to five minutes. But the difference is already quite noticeable with folders that contain only 500 or 1000 messages.

What is KMail doing there and why is it necessary? There has to be a way of speeding this up.

Thanks,

Jens