I don't want to sound blunt, but that Mobile Intel 4 series chipset graphics card (integrated), is very weak for a simulator like this. I am guessing it's a laptop because of the "Mobile" in the name? However, that does not mean you can't run US2.
There is still some optimization to take of, so it could improve for you in the future. If Giant Army begins to add more complicated computations to the game in the future, it may take more power to run it. Or it could be the complete opposite (hopefully it runs better).
As a side note, have you ever thought of buying a desktop PC? One that specifically plays games? If you bought a gaming PC (it doesn't need to be outrageous), you wouldn't have to worry so much about performance in games, as it will have more backbone when it comes to running them.