I have an MSI laptop (GT72VR 6RE). It has an i7-6700HQ processor and a GTX 1070. It runs Fallout 4 at about 60 fps comfortably. But in big battles in the total war games right the way from Medieval II to Warhammer the frame rate can drop to as low as the mid twenties. Can someone let me know how to get things running smoother please? thank you