Okay, unfortunately cheered too early 
The problem stil exist! I’ve made a short video where you can see the FPS drops.
To give a few examples:
0:03
0:11
And the worst one 1:23
Cleared rolling cache, SceneryIndexes, SceneryCache folder and Content.xml file deleted. This all doesn’t solve it… TLOD is now on 100… But even TLOD 70 gives the same problem. With the 13600k TLOD 150 was always perfect.