[Bug 168162] New: very slow filtering of messages in folder

[Mikolaj Machowski]

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http://bugs.kde.org/show_bug.cgi?id=168162         
           Summary: very slow filtering of messages in folder
           Product: kmail
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs kde org
        ReportedBy: mikmach wp pl


Version:           1.10 (using Devel)
Installed from:    Compiled sources
Compiler:          gcc4.2.2 
OS:                Linux

In big folders (local mboxes 20000+ messages) any filtering makes using KMail unusable.

I can normally use big folders with unthreaded folder view but with threads turned on everything is becomes very slow. Opening of folder with 20000 messages can take 10s, opening of individual message ca. 5s (which is really strange - I can uderstand display or operations on long lists but display of single message?). Operations on folder with 60000 messages takes several minutes. Problem with displaying vanishes when threading is turned off but *any* filtering is very, very slow (filter by flag, simple search).

Filtering is usable with folders up to 15000.

KMail 1.9 (KDE 3.5.9) is working fine with threading, filtering, searching in any folder.

Computer: Sempron 2200, 756M RAM.