I know this sounds obvious but it bears repeating. I was having terrible stuttering and very poor performance in my machine which were NOT solved by turning down down graphics settings. I am running an i7 (not K) and a 2080 super and the benchmark showed the CPU latency well in to the red on very high and high settings. I figured my i7 was throttling my 2080 super with this game and despaired. Then I updated my Nvidia drivers and ALL my problems went away and the game runs fine now on ultra.
p.s I live in Repton at the site of the ancient river crossing across the Trent. We have had remains of a Viking era midden heap dug up in our back yard. It's fascinating to see how the Devs have recreated the atmosphere of the area around us.