First of all 200 Terrain LOD is going to kill your performance around KATL. The entire surrounding area is overwhelmed with large trees to hide the hideous photogrammetry spike trees and combing that with high LOD would put a strain on any PC.I have to turn my LOD down to 100 to make things smoother when taking off and landing in at ATL but having the camera face the trees my fps drops in the teens.
To me its the worst optimized area in the sim and was just left there hanging.
Other areas like NYC,LAX I can bump it to up to 150-200.
You get the idea from the screenshot and this is not even 4k.
LAX also photogrammetry but way less trees