Version:            (using KDE KDE 3.1)
Installed from:    Mandrake RPMs
OS:          Linux

I must admit, my hardware isn't the faster on earth (k6-2 350MHz, 192M RAM) 
but when I do the following operations:
 - select many messages, right click on them, save as
 - open an imported folder, requirding .index and .index.ids rebuilding
 - sort a big folder which was never sorted before (requiring .index.sorted building)
kmail lasts several seconds (or tens of seconds) taking 100% CPU and without retracing
the window nor showing a progression bar.  I think this is unacceptable on a usability
standpoint... being slow is ok unless everything else gets blocked (which is really bad 
on interactive GUI-based applications.... recalls me when netscape 4.77 froze waiting 
for DNS resolutions, back in mid-nineties).