To everyone that thinks their phone can't run this, you're right. My Nexus 5, overclocked to 2.8 GHz runs this exactly the same. This isn't a hardware problem; you'll have to wait until the developers update the application. It needs more optimization for GoW.
For all of you who keep asking, download the three parts, put the .rar's in one folder, highlight all of them while they are in that folder, and right click them when all of them are highlighted, and click "Extract here". That's how you use multi-part .rar's.