Extreme slowlyness when moving/resizing windows

[Remco Poelstra <r j poelstra student tue nl>]

Hi,

I have some problems with gtk lately. When I move or resize a window it 
takes sometimes up to 10 seconds to complete. It uses 100% CPU also. 
Displaying a new window is as fast as usual.
It doesn't matter what theme engine I use.
I'm using gtk 2.2.0, Gnome 2.1 and metacity 2.4.13.

What is the cause of this and how do I get rid of it?

Thanks in advance,

Remco Poelstra