Steam/HTC Vive/i5-4690/GTX 970/Thrustmaster TX
Tried both low and ultra low settings with the recommended modifications (AA off, no ground cover/crowds, etc.), and while frame rate is good I find that the world view is very laggy in VR. Interestingly enough the UI overlays don't lag at all. It's very noticeable when you turn or move your head, and the effect is pretty nauseating. I've recorded the effect in the pause menu in the following Reddit post:
https://www.reddit.com/r/dirtgame/comments/cz90yi/dr2_vr_camera_lag_in_18_openvrvive
The effect doesn't look as severe in a 30fps video, but you can see the green starting line sign lagging behind the menu text.
The real weird thing is I had no lag in VR the day before yesterday, but when I launched around 0930 BST (the 1.8 patch got queued for download right after I launched) I experienced very, very heavy lag of this sort. With the 1.8 patch this lag is reduced, but still in the unplayable category.
DiRT Rally 2.0 2019-09-03 11-31-36_Trim.mp4