I really don'y get it. I have an older PC and my son has a cheap HP (Celeron 3Ghz with inbuilt video). Neither of us have had any real performance issues but it seems that people with super fast PCs, dual core, Dual video cards etc. have more problems.
I'm not sure if it is possible but can you disable any of the processors to slow things down and see what happens ? (i.e. bring your PC down to my PCs speed)