The question that you asked, and deleted, and then asked again, and then deleted again, is off-topic. It doesn't fit within the scope of the faq.
Perhaps, if you'd have left your question alone for more than a minute without deleting it, someone would have been able to respond with constructive criticism.
For anyone with enough rep to see deleted questions, this is one of the permutations of the question at hand:
http://serverfault.com/questions/446431/maximimizing-performance-for-doing-builds-on-windows-7-inside-virtualboxhttps://serverfault.com/questions/446431/maximimizing-performance-for-doing-builds-on-windows-7-inside-virtualbox
