First of all I had good enough specs to play the game smoothly with shadow distance set at high and godrays set at medium and everything else at high or ultra and never had any bad fps drops anywhere and now in cities and when looking in certain directions it drops to as low as 15 fps which you can imagine is pretty annoying...I decreased the shadow distance and godrays like most people are saying and nothing has changed if anyone could explain to me why this is happening that would be very helpful.

thank you.

I have:

16 gb of ram

AMD FX-8350 eight core processor

Geforce GTX 770