Even in the countryside, with nothing, nor no one around, every few minutes the FPS will drop from 30+/- to zero and the screen will freeze for five to ten seconds. When this occurs, the CPU activity drops dramatically and I do not hear any hard drive activity.
Anecdotally, the game seems more likely to do this when the character is running, or jogging, but it can happen at any time.
The game has always done this, but it seems to be particularly bad with this build.