I am looking to make the jump to Windows 8.1 from Windows 7. I am looking to get some input from the community about any performance gains or loses anyone has had with games or in general. I have been wanting to make the jump but today may be the day and I just need the push. (It is on sale for 79.99) and is there much of a difference between Pro and Core? I wont really be needing the added security or the remote desktop.