The issue is also related to this topic: EDDK (Köln-Bonn): Photogrammetry leaking into airport scenery (default)
I do not have the Aerosoft scenery, and when I approached - and actually managed to land - at EDDK for the first time this evening, my fps tanked down to 1 to 3 at times, making the sim a slide show. Really great on VATSIM. The whole airport then was cluttered with photogrammetry scenery and aircraft, looking awful close-up and blocking a lot of stands.
I could resolve this by deleting the ‘City Update 1 - Germany’ AND deleting and reconfiguring my Rolling Cache, but that can’t be the final solution…