Bug 173226

Summary: Kmail slow on large folders with threading on
Product: [Unmaintained] kmail Reporter: Tim Holy <holy>
Component: generalAssignee: kdepim bugs <pim-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: normal CC: christophe, jtamate, lemma, mboquien
Priority: NOR Keywords: triaged
Version First Reported In: 1.10.1   
Target Milestone: ---   
Platform: unspecified   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Tim Holy 2008-10-21 12:53:40 UTC 
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.
Comment 1 Jaime Torres 2008-10-25 09:19:04 UTC 
In kmail 1.10.90 (kde 4.1.70), with folders with more than 2000 messages and thread messages, it is as fast as unthreaded messages for me.
Comment 2 Michael Leupold 2008-11-11 19:29:16 UTC 
I can confirm this bug using kmail 1.10.1 from KDE 4.1.2. I'm not quite sure but it seems all of kmail is getting slower when enabling threading in a folder I have ~25000 messages in.
Comment 3 Christophe Marin 2008-11-14 17:13:47 UTC 
If it's confirm, let's reassign :)
Comment 4 Christophe Marin 2008-11-14 17:13:59 UTC 
confirmed*
Comment 5 Médéric Boquien 2008-11-14 17:21:52 UTC 
This  should be tested with the latest message list, it could make a difference.
Comment 6 Thomas McGuire 2008-11-14 17:29:01 UTC 
> This  should be tested with the latest message list, it could make a difference.

Exactly, switching between messages is uncanningly fast now.

*** This bug has been marked as a duplicate of bug 163469 ***