I'm running Steam version of MSFS2020 in VR only with HP Reverb G2 on my AMD Ryzen 9 5900X with Sapphire Nitro RX 5700 XT (8GB Vram) in Pcie4 with SAM enabled and 32GB 3600Mhz DDR4 in XMP memory and everything is installed on Pcie 4.0 NVMe Samsung 980 Pro SSD's running absolute latest Windows 11 Pro and my X570 Gygabyte Aorus Master is using latest bios F36b "AMD AGESA V2 1.2.0.6 B" and nothing is overclocked and Ryzen is running cool water cooled.
Flying over London with Orbx "EU Great Britain Central" V1.0.0 + "Landmarks London City Pack" V2.2.0 runs ok with Photogrammetry on + Also latest Bijan's 4 season pack V7.2 + all his addons. Tried it again just today and could not even start start the sim with your Heathrow airport that I like a lot. I'm just reporting it so you know and can fix and improve your impressive addon. Love the Concorde at your airport 🙂