I experience that problem when I dualbox on my desktop without using Keyclone. However when I do it with keyclone I dont have that problem, and that's with a single core AMD 3200 with 2gigs of ram and a Geforce 7900GT. If you can you should try Keyclone and see if it solves that issue for you. Keyclone lets you setup which wow runs on which core. (I do that with my laptop with a GMA950 and 1gig of ram on a core duo 1.8ghz and never really have problems at all.