[Bug 233134] New: loading a local folder with 1000+ unread messages is amazingly slow

[Thomas Fjellstrom]

https://bugs.kde.org/show_bug.cgi?id=233134

           Summary: loading a local folder with 1000+ unread messages is
                    amazingly slow
           Product: kmail
           Version: 1.13.2
          Platform: Debian testing
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: tfjellstrom at shaw.ca


Version:           1.13.2 (using KDE 4.4.2)
Compiler:          gcc 4.4.3 
OS:                Linux
Installed from:    Debian testing/unstable Packages

Switching to a folder with 1000 or more unread messages causes the folder list
to scan each and every mail in said folder, which in some cases means scanning
10k to 100k or more messages. It can take minutes on my dual core 2.53Ghz
laptop to finally get to a point that I can use the folder. I have the folders
set to display in threaded form if that makes a difference.

To reproduce, just find a threaded folder with tens of thousands to hundreds of
thousands of mails, and make sure at least one thousand or so of the messages
are unread, and it should take kmail many minutes to thread the entire folder.

Expected behavior, switching local folders should be near instantaneous.

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