My US is running at 3 fps max. I have tried to uninstall/reinstall, change graphical settings to their lowest, restart my PC (Windows 8, Pentium IV @ 2.4GHz, 4Gb RAM, Intel HD Graphics 4000 512Mb VRAM) and no matter what, it still runs at 3 fps. This happened after I ran a performance test out of curiosity. Before that, it was running at 30 fps max and the lowest was 5 fps. Help!