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http://bugs.kde.org/show_bug.cgi?id=98233         
           Summary: Changing between IMAP folders is incredible slow (for
                    folders with more than 50 messages)
           Product: kmail
           Version: 1.7.2
          Platform: unspecified
        OS/Version: FreeBSD
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kmail-devel kde org
        ReportedBy: kde schmalzbauer de


Version:           1.7.2 (using KDE 3.3.2, compiled sources)
Compiler:          gcc version 3.4.2 [FreeBSD] 20040728
OS:                FreeBSD (i386) release 5.3-STABLE

kmail can't handle IMAP folders with more than 50 messages in acceptable time.
I have several folders, each with about 2000 Mails and just choosing a different folder (let's say my current working folder is INBOX and I want to change to SENT (by clicking on Sent) takes longer than OutlookExpress needs to download the complete headers of the folder (I recognized this dramatic impact because I had a windows machine here and needed to view a specific message and found out that a folder change in kmail as described above takes 20 seconds and OE managed to display the INBOX of the new created account in about 15 Seconds, while it had to download all headers first. Changing folders in OE (on exactly the same HW of course) takes 0s (not measurable) while the same action takes ~2 seconds in Thunderbird and about 20 seconds with kmail).
I made sure that there's nothing wrong with any setup and like described above, other programs can handle the same folders from the same server with the same hardware connected via the same network (100BaseTX) very well.
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