Major FPS drop at Star Airports despite RTX 3090. Need Help ASAP

I also fly on 4k and the GPU load goes from 99% in a non-star airport to 40% and then stays there. Let me show you 3 screen shots the first is normal flying in Dar-es-salam which is non-star airport.

The next two are at KJFK .

Can any of you guys please figure out what’s wrong ?

Again my config is:

i5 9400F
RTX 3090
32GB RAM
200Mbps internet speed
1TB SSDs for MF2020
All settings maxed out on Ultra running on 4k 4086 resolution