I’ve been going nuts with Nvidia drivers, changing settings and even reducing resolution to cure terrible performance around airports, both addon and default, since the UK and SU3 updates.
Turns out a lot of them seem to be linked to Zinertech airport textures. They updated yesterday, I installed today, and many of my problems seem to be gone. This is just for airports- I can’t speak to anything else, but my frames would go from 30 (modest system) to 10 at a lot of places, even airports that aren’t that complex.
Now things are back to normal as far as I can tell. If you have any texture mods, try updating those before going nuts looking for tweaks and new drivers and such. Maybe that will help.