I will recreate your setting and location today. But i wonder already why you only have about 4,x Gb of VRAM in use in WQHD? I found out that when putting it on LOD400 (i.e. in Big Apple), it will scratch at the 8GB limit of my rtx3070 pretty fastish.
Also i assume from my tests, that the US locations are somehow better “optimized” than where i fly in europe mostly… With LOD200 in Manhattan i get around 45-50fps with LOD200, but in Nürnberg (my hometown), which is also a beautiful photogrammetry city, but far from the “complexity” of Manhattan, my fps drop down to 35-40 currently.