Hi Duncan, thanks for your long answer. So here is some more information. The CPU is a dual core Intel T2050 @ 1.6GHz. Since i have a laptop my sondcard is a build in Intel HDA. See lspci: 00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 02) With Kubuntu 10.4 my desktop efects also seems to be slower. Maybe the grafics driver has been changed. The grafic card is a Radeon Mobility X1400. lsmod says that i using the radeon driver. Duncan schrieb am Freitag, 23. Juli 2010 21:48:18: > Desktop ___________________________________________________ This message is from the kde mailing list. Account management: https://mail.kde.org/mailman/listinfo/kde. Archives: http://lists.kde.org/. More info: http://www.kde.org/faq.html.