Im aware of the fps problems regarding cities, but my problem is random. While moving around map my frames randomly drop to 2-3 fps and remain so. I can fix it by setting any graphical setting and its back to where it was before the drop. THis usually happes once every 20-50 mins. While it happens, all the shapes get very low quality and I could see through walls if it happened indoors. Also the menu will start to lag.
OS: Win Vista 32bit
CPU: Intel Dual Core E4500 2.2GHz
GPU: Nvidia GTX 750 TI
Anyone else has this issue,