I would like to ask is there any solution to my problem.

My specs:

Motherboard - ASRock P67 Pro3
Proc - Intel Core I5 2500K
Memory - 2x4Gb DDR3
Graphics - NVIDIA Gforce GTX 660 Ti TOP version.

When I run in the wilds I have ~70 fps... when I go just into the city or a town my fps drop to... 13!!!

I have checked almost all drivers that are for the GPU, updated BIOS, updated motherboard drivers and I still have the same issue. What is interesting - Desktop Normal, Desktop Max - no change at all...

Any ideas what can cause such problems?