So I feel like that too, and im curious if its the same for you: Is the game actually lagging, or is it the head movement?
For me, I found that when I keep my head straight and dont move, and then make the aircraft pitch and turn, everything is smooth. But when I turn my head, or move it sideways, its extremely stuttery. Almost like theres some kind of "overshooting" back and forth ghosting. So the plane and world around is fine, its actually the head movement that stutters.
If had no better way to put it, it kinda feels like theres some kind of smoothing forced, that works for the planes movement (motion vectors?) but completely screws up my head movement. That is despite having SteamVR smoothing and ASW disabled.
This issue is only in MT for me (which forces OpenXR), while ST+OpenVR is fine.
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That is using Pico4 + SteamVR for both OpenVR/OpenXR.
