I've got no other Custom Scenery exception the Orbx and I fly Helicopters at low level around the City of Seattle so I wanted some high quality and to avoid the hassles of messing with the ini file, I figured it would be easiest to go with all Orbx scenery. However I recently bought two new packs from Orbx to add to my experience and now, at least Boeing Field Airport has almost no objects. I've got World Object on one click less than High along with Parked Airport, etc and I'm using a GeForce 3090 card with 24Gb of Vram, plus before I installed the Seattle Airports and Landscapes it was better.
Sorry I couldn't get a better screen shot of the airport but it's basically blank and the "black spots" make it looks like my World Objects is low, but I can assure it is not. It was much better BEFORE the installation of the Seattle Airports and Landmarks.
scenery_packs.ini