On Isle of siptah there are massive FPS drops as soon as I look towards the southern island. It only affects the desert island and the volcano area. So fighting and generally traveling to this area is not possible. I thought the performance update would fix this problem. Unfortunately, it did not get better. The rest of the map runs stable. Also the settings between performance and quality do not bring any improvement.
In itself, the Xbox series S should manage this easily. Especially since it works stably in other parts of the map