Interesting but my Core 2 Quad runs the CSX 777 quite smoothly without any hassles, perhaps Mark has to tweak hi machine to get the sort of response he wants,I googles Jesus Bojote's FSX tweak tools;his online tweak tool should be able to help you out on this...I also suggest he gets a new Nvidia Video Card,it will go a long way to help.
Secondly,I learnt that CS wants to release a version 1.2,how true is this Thanks. :)