Vraciu, it is not worth it to upgrade your CPU, even though you would be going from a 3.0 GHz dual-core CPU to a 3.4 GHz quad-core CPU, you will not gain hardly any boost at all.....you will still be using the same limitation of 4 GB system ram....
Vraciu, I don't know why I didn't think of it or post it sooner.....but there is a strong chance that AH is only using a single core of your dual-core CPU since it is an old Athlon II x2 CPU.... Very few of them would work using both cores in AH back when your CPU came out....most of the AMD dual-core CPUs only used 1 core...
So, if you wanted to spend $54 for that AMD phenom ll Q965 quad-core CPU, there is a 50/50 chance that You can get AH to use more than 1.... One of my AMD builds has an AMD phenom ll Q975 quad-core 3.61 GHz CPU and it uses more than 1 core....
Sorry I missed thinking about or posting this sooner....
Have you cleaned up and tweaked Windows 7 OS yet?
TC