The game’s framerate stays strong at 144 but it is physically unplayable because it looks choppy as can be. Like its at a low framerate but isnt
It happen to me when im playing Reach or H2A (just multiplayer, story works fine), by the other side it works really smooth in H2. For sure they have to apply some kind of fix, I read that seems that the game animations are locked to 60fps.
Here you can actually read that they are aware and trying to fix that (for H2A XD):
https://support.halowaypoint.com/hc/en-us/articles/360042883072-Halo-2-Anniversary-Known-Issues-05-12-2020
> Halo 2: Anniversary
>
> - There is visible stuttering on objects when strafing with Unlimited Framerate enabled