Just retested London yesterday starting from EGLC, with latest Orbx EGLC + London landmarks updates, all coming from MSFS marketplace. Was flying the vanilla Cub around 1000ft, RT weather
Everything was fine, photogrammetry ON, and 8 Gb of Rolling cache (this did clearly enhance UX and reduce buildings melt due to PG loading time)
Was around 25 FPS all around the place, on my modest i7-8750H / 32 Gb / GTX1060m-6Gb. Settings set to High
GPU%: 80%-100%, CPU%: around 50%, VRAM%: 90%-100%, RAM%: around 65%
Good flying experience, in a place I consider “a worst case conditions”
Note that with Photogrammetry off, FPS is better, but flying over London is unrealistic, buildings are too generic and not representative of original ones
So I prefer Photogrammetry ON, especially over this place