I have HP Pavilion with Inter core i7 processor, ATI Radeon Mobility 5650,4 GB Ram, and I have trouble running a games as simple as Civilization 5. As the game advances and I discover the world (even before I discover all map), every time I go through the map it takes time for it to load it, runs a bit slowly. even on low graphics. I mean, that can't be on such a simple game and a solid Graphics card like mine. Can I improve the performance?