[Bug 270849] New: Threading by Recent Activity is extremly slow

[Andre Heinecke]

https://bugs.kde.org/show_bug.cgi?id=270849

           Summary: Threading by Recent Activity is extremly slow
           Product: kmail2
           Version: Git (master)
          Platform: Compiled Sources
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: message list
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: aheinecke at intevation.de


Version:           Git (master) (using Devel) 
OS:                All

If I look at a folder in KMail2 with 15392 mails it takes less then a second to
show the messages in the messagelist if i have threading disabled (Flat Date
view)
When I look at the same folder in threaded view Activity by Date, threaded it's
also nearly instant.
But if i use Recent Activity, threaded it takes 22 seconds before the messages
show up in the list. Meanwhile the counter slowly counts up the threads to
6800.
CPU goes up during this time.

Reproducible: Always

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