I have poor fps at EDDK. Is there any tweak to improve performance or do I just have to lower settings? Using 5800x, 6700xt and 16gb 3600 RAM at 1080p with vulkan. I have med - high settings yet get sub 30fps in the a300/10 here and only just 30 with the zibo. 

The airport region is a bit CPU heavy with the city of Cologne very close. Did you try FTU to improve performance in general? When I did the latest update I still got about 60 FPS with only a GTX 1070 and a not so performance heavy aircraft, but I always use FTU to get good performance, XP11 itself still has performance issues and lots of aircrafts make the situation even worse.

 

https://flyagi.de/flyagi-tweak-utility