Tried this in 200.0.0 and the performance is much worse than 100.6.0.
The Windows Game Bar stuff shows an FPS readout. When rotating the Line of Sight demo in 100.6.0 earlier, I got around 10-12 FPS consistently, while it was loading and when it was finished loading. (This is on a laptop, not a powerhouse.)
I ran the same in 200.0.0 right afterward, and the FPS was comparable while loading and then dropped to a consistent 6-7 FPS after everything was loaded.
I observed this years ago when I tried to upgrade past 100.6.0. The 3D performance was significantly degraded in my application as well, and I had to stick with the old version.
Is there any plan to fix this? It's easily visible in your own demo application. Please just revert to 100.6.0 in your demo app and run one of the complex demos like Line of Sight, and then run the same in 200.0.0 and see that the performance was much better previously.
I use the 3D display for my application, and the performance in the later versions isn't good enough for me to work with. I hope that you'll make this a priority to fix.