[kdepim-users] kontact 4.1svn unbearable slow

Mikolaj Machowski mikmach at wp.pl
Fri Jul 18 08:35:42 BST 2008

On Thursday 17 of July 2008 23:47:11 Ingo Klöcker wrote:
> > I found where problem is: big folders. Relatively speaking. In small
> > folders, up to 2000-3000 thousands of messages it is fast. Well, not
> > really. Fast is in folders < 1000 messages. Up to 3000 it takes ca 2
> > seconds. In kdepim-users with 8700 messages it begins to slow down.
> > Displaying of your message took 3 secs. Much bigger pain is with even
> > bigger folders. digikam-devel has 22000 and displaying of message
> > lasts there up to 9 seconds. Similar to vim-devel with 20000. Real
> > disaster is with vim-list (60000 messages) stopped waiting after 2
> > minutes.
> I just made a quick test. Opening the inbox of my test account (IMAP) on
> googlemail.com took quite some time because KMail had to fetch the
> headers of 78458 messages. Afterwards opening this folder repeatedly
> took about 30 seconds (after a restart of KMail). The CPU load went up
> to 50 % (i.e. 100 % on one CPU core) for the better part of those 30
> seconds, so opening such a large folder might be much slower on a less
> powerful system. FWIW, I'm using openSUSE 10.3 x86-64 on an Intel(R)
> Core(TM)2 CPU 6600  @ 2.40GHz.
> For comparison: Opening a local maildir folder with 51808 messages with
> KMail 1.9.9 (KDE 3.5.9) took about 15 seconds. So KMail 1.9.9 seems to
> be a bit faster than KMail 1.10.0, but not by far.
> As always with such measurements: Your milage might vary.

I have Sempron 2200 + 756 MB of RAM. All folders are local mbox'es.

I've made quick test and returned to "old" KMail 1.9.9 (under KDE4): opening 
of folders lasts from 0 to 9 secs (of course the biggest 60000) and display of 
messages only 1 second!

And not only that. Scrolling in 1.10 is dead slow. Also other interface 
elements are slower than in other KDE4 apps. 

I recompiled KDE4 with release option (scrapping whole debug info) and it 
greatly helped with RAM and cut 2-3 secs from message displaying time (in 
20000 folders) but it is still too long. I am returning to 1.9.9. Pity about 
KOrganizer part but didn't see anything special in new KMail.

But I'd like really to solve that. Whats happening?


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