Performance - Microstutters + Hitches and Poor Frame Rate
I'm on Series X and there are now small stutters/hitches pretty much constantly no matter what the player count is...happens in 32, 64 and 128 game modes.
They are subtle but incredibly annoying as well. They are really visible when you are running.
Other than that, the framerate on Series X will still tank at times but it's definitely less common than it was. The frame rate performance needs improvement as always...especially during heavy action and also during 128 player modes.