EpisparhMy fps is usually 50-60. In conflict zones it drops to 25. I've noticed that on some planets (with more features such as stones and biologicals) around settlements the performance drops to unplayable 5-9 fps slideshow. Fires and scavengers can lead to additional performance drops. The game is poorly optimized - this is the truth. You can throw better hardware at it but you still risk performance drops in some situations on-foot, where a second flickering can lead to failure in whatever you doing.
My FPS on ground settlements sometimes drops at 1FP10S (1 frame per 10 seconds).