KDE (and other things) very slow since last update

Hi,
I've upgrade yesterday with lastest KDE packages, and now KDE start and each 
application start is very very slow...
Even for a simple 'kwrite' start, the CPU goes 100% for ~15 seconds, then 5 
seconds of 'inactivity' (cpu usage ~2%), then the window opens.
If I close it, and restart it just after, the same.
I tried it just after starting KDE (very long to start...), and memory usage 
still low (=> no swap used).

Before this update, all was working very fine with packages version 3.5.0-3, 
and now, with the 3.5.0-5, all KDE stuff is very slow.

I don't use to use gnome, so I can't tell if it is only a problem of KDE or 
more generally.

It may also comes from the X upgrade (6.9.0-4 -> 6.9.0-8)...
I didn't upgrade the kernel, which still a 2.6.12-12mdk

Are other users have same problems?

Fred


-- 
Frederic Marmond