Haha, well, I’m getting to the laggy part now, zoomed out with 2 more medium stands and like 35 commercial planes a day it now drops to 23 fps, 13fps at 3x the speed. Zoomed in(busiest part of deboarding a bombardier with new pax on screen) at 3x speed I’m still at 50 fps. Zo only the zooming out seems to be an issue. But well, maybe it has something to do with the missing GPU 
It’s not you, it’s the fact that the objects don’t have appropriate LOD switching so they’re all incredibly detailed when you’re far away and can’t even see the details. It’s something that’ll be worked on once the major bugs have been fixed.
Alright then! To mega airports in a couple of months then! 
HINT