Bad performance (Low FPS) with World Update 3 and new London photogrammetry - possible memory leaks

Something is definitely wrong with this update I ran my game on ultra before and had steady fps 35-40 now I’m getting low 20s

I’ve changed all settings and the only thing that makes a difference is the Terrain Level Of Detail something is definitely bugged with it. My sliders were both set to 100 before the last update. When I drop the slider for terrain level of detail the fps go back to what I was getting before

But when flying the terrain looks terrible my fps was perfect before the latest update I don’t get it