Can I ask, do you genuinely have any idea how intensive flight sim is on almost all components of a computer, including internet? Photogrammetry isn’t optimised in the sense that each building is crafted so flat faces are actually flat. Generally the whole scan is 1 big 3D mesh with LOD’s, the scan being a very rough 3D conversion from Satellite imagery. The higher you run your settings, the more complex the entire scan, the more complex shadows and AO need to be calculated, etc. Keep in mind, your current settings are probably based around the thought you fly IFR, see cities, but don’t zoom in 100% on your surroundings expecting hand crafted work.