I've been having some frame rate issues since the last patch. I didn't have any when playing Halo Reach on Xbox One X on a 4K TV, but I've been re-playing Halo 1 and 2, and I've seen a lot more than usual every time I'm in a combat sequence. The Frame-rate would drop constantly, and I notice some screen tearing. I haven't Playing Halo 3 or 4, so I don't know if it affects all the games.
Came here to report the same thing.
I can't talk about Halo 1 as i haven't tested, but there has been a big degradation in performance in Halo 2 campaign when using remastered graphics.
The framerate drops constantly during firefights, especially bad if duel wielding and firing both weapons at once (smg+plasma rifle is a stutter fest.
Screen tearing is now very noticable, even in seemingly simple scenes with not much happening.
I have played H2A campaign countless times, and although it wasn't 100% locked at 60, it was pretty damn close, and screen tearing was very, very rare and only appeared at the top of the screen, making it very hard to notice. The current version is a clear downgrade and makes for a very unsatisfying gameplay experience.
Playing on an Xbox 1X, hdr enabled, installed to the internal hdd. Running latest Alpha skip ahead OS. Hard reset has been performed.
EDIT: Just tested Halo 1 with remastered visuals. First stage had framedrops and tearing, even in simple empty corridors, that wasn't present before. Also played the first half of Assault on the control room and suprisingly performance was excellent, despite the large open areas and lots of A.i and explosions.
Halo 3 seemed perfectly locked at 60 from the first stage i played.