When I try to load a game that I have manually saved, I always get problems that point to not enough memory, such as really slow gameplay (taking a long time to scroll around the screen, scrolling doing jerking motions), graphics go way off. The strange thing is that this happens only when I have loaded a game. I can load Civ, start a new game, and play and finish the game with no problems, but not if I load a save.
Any suggestions?

Also, I have an Intel M Processor with 512 RAM