Luckily my Acrobat XI, AutoCAD 2012, Alibre 2012, ... performance better than the previous version.
I might be inclined to believe you, except you list Adobe products and AutoCAD.
Software is a complex beast, and often "performance issues" aren't always the fault of the software or hardware, and are difficult to pin down.
I just did some test with Excel, and it's performing beautifully on my dual core gen2 i5, even though I'm running high memory and CPU utilization because of something else I'm running. As impressive as your machine may be, you've got something else going on.