[Bug 172580] New: kmail is very slow when it has many unread messages (around 6000)

[Arne Babenhauserheide]

http://bugs.kde.org/show_bug.cgi?id=172580

           Summary: kmail is very slow when it has many unread messages
                    (around 6000)
           Product: kmail
           Version: 1.10.1
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: arne_bab at web.de


Version:           1.10.1 (using 4.1.1 (KDE 4.1.1), Gentoo)
Compiler:          x86_64-pc-linux-gnu-gcc
OS:                Linux (x86_64) release 2.6.25-gentoo-r7

kmail responds very slowly to user input - I assume it is caused by many unread
mails and my check seems to verify that. 

Background: 

I am used to not only reading mails, but to also collect them from my favorite
mailinglists so I can read up / search in it later on. 

Also I tend to leaving spam as unread and doublechecking every unread mesage
about once a month before markin it as spam (which I didn't find time for
during the last two months). 

That way my unread mail count grew to something above 6000, and kmail grew
slow, bordering to almost unresponsive (>10s wait time, until I could see a GUI
reaction). 

To test my hypothesis, that the many unread mails are causing that, I marked
about 4500 of them as read (1500 unread remain), and kmail became much more
responsive (the reaction times for scrolling are below 1/3rd of a second
again). 

What happens there in the background which creates that massive amount of load? 

Aside from that, the KDE 4.1 kmail feels much leaner that the 3.5 version
(especially because it doesn't block when retrieving mails, I think). Many
thanks for your great work! 

Besides: The biggest part of the load seems to have been "waiting" (checked via
top).


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