Graphic Settings for Scenery Mods

I’m really enjoying the new photogrammetry & scenery mods which are greatly improving the sim and I can just recommend them to everyone who is looking for an even more realistic experience, for instance look here:

https://forums.flightsimulator.com/t/guide-find-catalogues-of-msfs-addons/260120

Now, as great as they look, the problem becomes very apparent after the first flight, especially for VR users. The hardware specs are even more demanding and after trying out different graphic settings, I coudn’t really find any difference in FPS or even in the graphics of those external sceneries.

Does anyone here have experience with those scnenery mods and figured out how to improve FPS or do the ingame graphic settings not affect those mods at all (which I think is the case)?

Thanks for any Ideas!