http://bugs.kde.org/show_bug.cgi?id=173226

           Summary: Kmail slow on large folders with threading on
           Product: kmail
           Version: 1.10.1
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: bugsquad-triage@kde.org
        ReportedBy: holy@pcg.wustl.edu


Version:           1.10.1 (using 4.1.2 (KDE 4.1.2), Kubuntu packages)
Compiler:          cc
OS:                Linux (i686) release 2.6.27-7-generic

I just upgraded to KDE4 via Kubuntu Hardy->Intrepid. I have several mail
folders with more than 10000 messages. If the folder's "Thread messages" box is
checked, then switching from one message to the next is painfully slow: if I
click on the next message (or hit shift-+ to go on to the next unread message),
there can be a delay as long as ~1s before the text of the next message is
displayed. This is much slower than under KDE3.5.

In contrast, if I turn off "Thread messages," navigating among messages is as
fast as ever. The difference is so large that I'm turning off threading for all
of my large mail boxes.


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