(Edit still later) Since not all i3s and i5s are actual quads, and the hyperthreaded capability doesn't fully pick up the slack, let's look up that CPU, shall we? (Back in a shake.)
It would appear that you need (no, just "could benefit from") a CPU upgrade (easy to do in a Desktop, generally impossible in laptops).
http://ark.intel.com/products/65693/Intel-Core-i3-3220-Processor-3M-Cache-3_30-GHz
I was in error there. That PC should be running the game better.
