I think I found the cause of the low fps. The initial condition is in the cockpit of a 747 at KJFK on runway 31L. With photogrammetry off, the fps is standard on my system and no different than it was in SU6. But if we turn on the photogrammetry, we see a drop in fps almost 2 times and jerk when reviewing the mouse. At the same time on the horizon you can see skyscrapers, which is not with FTG off.
45 fps, photogrammetry OFF:
27 fps, photogrammetry ON:
Let’s complicate the experiment and in slew mode fly the 747 closer to Manhattan. Oddly enough, in both modes the fps is almost the same:
47 fps, photogrammetry OFF:
45 fps, photogrammetry ON:
It seems to me that the simulator doesn’t handle LODs of objects with photogrammetry correctly and they are seen at a huge distance, which ruins the fps dramatically. As a temporary measure I would recommend to disable photogrammetry until developers will fix this bug.