So I got my new iMac yesterday, it's a 21.5" with 4GB memory and an i7 processor. It's all great except this... I switched using the migration assitant from a time machine backup, when I tried going on VirtualBox on my new machine my Windows XP machine was ultra-sluggish, so I installed Windows 7 on VirtualBox but it's still acting really sluggish? I also tried deleting and reinstalling the app, no luck. What I mean by sluggish is.. the graphics things move really slowly with a low framerate, and when I hover my mouse over the machine's display horizontal 'window lines' are made it's kinda hard to explain, the graphics are a bit weird basically. The virtual systems are pretty much unusable.