The ActiveHome Pro software ran fine on my laptop (1.6GHz Pentium M). I now found a new home for my USB interface which is a Celeron 333MHz. Yeah - I know - old piece but it should really be fine for Home Automation.
THe Avtive Home Pro software, however, is running reeeaally slow. It's all that fancy graphical stuff I guess. Oh man, I can't wait until HomeSeer supports that CM15A.