I was flying an F-18 between the buildings of New York City to check for stutters with my Aerofly graphics settings and finally settled on the following for the 6 adjustments - UHHMLL (U=Ultra, H=High, M=Medium, L=Low) which give me a rock solid 90 FPS in VR using a Samsung Odyssey (4.6M pixels) with the Aerofly Render Scale = 1.33 .
While dodging buildings, I noticed how straight 5th Avenue looked (about 3 miles) and that it ran into Central Park so I decided to give it a try with 50 feet of altitude !
NO PROBLEM !!! - made it out in one piece thanks to the smooth 90 FPS !!!