Im running GWX2 default campaign on a oldish PC 2.6ghz, 2gigs of ram and 6600GT 128ram. GWX2 runs fine in game, but i do have a very long load time 3 to 5min when starting a patrol, i just figured it was cause its a heavy mod and is loading lots of stuff, then again the CPU is only a 2.6 that could be why. GWX1.3 loaded quicker.
But it dont bother me, gives me some time to go off and make a coffee