Well I've been keeping my computer real clean and optimized so it can be very fast, I've done a lot from going to the old 90s look to disabling stuff running, etc etc etc, I've also found AIM slows the PC down, anyways , but now I felt like trying something,

I really love the mac theme apple users have, and I see I can download the leapord theme, then get vista glass and I should have it?

But I'm wondering how this will effect my computer performance wise? or even if there's a risk to do it at all?