Right now I was doing the cross-game playlists that are only available on the Xbox One version ATM and after going from Reach in Halo 2 in the playlist, the Frame Rate on Uprising level in the Anniversary Graphics were so abysmal in the outdoor sections that it hitched and stuttered really badly. Also the checkpoints freeze for a second every time I get one, which is very annoying. Before Reach was added months ago when I was working on the Halo 2 achievements earlier this year, I don't remember the performance being less than smooth FPS at 60, its definitely going below this now on the Xbox One X. However when I go into the classic graphics, the performance is perfectly fine as it always has been. Hope this gets addressed when 343 works on Halo 2 Anniversary for PC in 2020.
Halo CE/2/3 Anniversary FPS abysmal on Xbox One X!