So ever since launch i had this problem with random FPS drops down to 1, been trying to figure out what the problem is and narrowed it down to the Shadows Setting, i had it at Medium just like in the beta and had these huge FPS drops randomly and frequently sometimes every 5 to 10 seconds. Now I tried every setting, on settings Lowest, Low, Medium and High you get FPS Drops on Off and Very High you get no FPS Drops at all on Very High only a slight drop when the time of day arrives when shadows go away but its so short you hardly notice it. I think they really need to optimize the shadows settings as it makes no sense at this moment. So if you have fps drops try this out.