To get an idea of what I'm seeing, I took a few videos.
First is a photo just to show off my screen - it is a 180 deg cylindrical screen with a 54" radius. About 180" of screen width. Three infocus SP5000 projectors, using FlyElise ImmersiveDisplayPro to warp/blend the three images. Total screen resolution is 3840x720. Also keep in mind that this photo was taken with a fisheye lense, as that's the only way to fit the whole screen in one shot
These videos are very short, only a few seconds, but are just to illustrate what I am seeing.
This first video shows how it is with sim_mode = false, flying around in exterior view. FPS is about 30, nice and smooth.
The next video shows how it is with sim_mode = true, flying in the cockpit view. FPS is about 17, and is inconsistent. You can see it jerk every once in a while.
(sorry for the quality of this video, I'm not sure what I did to make it so crappy)