Desktop effects Windows open slowly


I’m pretty new to OpenSUSE. I’ve successfully installed the ATI proprietary driver from the ATI homepage. Activating Desktop Effects worked fine as well. The animations and effects work great, nice and fluent. Also minimizing works fine.

However, when opening a program or restoring it after minimizing, it takes about 2-4 seconds. (With deactivated Desktop effects it opens up instantly.)

My configuration:
LG - P1 Express Dual
Pentium Dual Core 1,73 Ghz
ATI Mobility Radeon X1400
1 GB Ram
OpenSUSE 11.1

Hopefully someone can help me. Thanks a lot.