I have Windows 7 as a virtual machine on my iMac using VMware Fusion. The whole reason I wanted VMware was to use Mac OS X and Windows 7 at the same time. But when I have Windows 7 running Mac OS X goes slow >.> Windows 7 is running like a dream but I find it hard to multi-task between both operation systems as Mac OS X is laggy. Is this just something I have to live with? or can I speed it up?