I bought Day One edition and installed into Steam. Immediately had bad stuttering and lag through various updates until a couple of months ago, when it worked OK finally in 2D. Then when VR came out, same thing. I can't run any preset above "low" and even then I have to turn off the settings recommended in an earlier guide (Ambient Occlusion, ground cover etc.) My machine should easily run Ultra but the stutter and lag is extreme, so I reduce settings as above (low or off) until the stutter is small enough to cope with and play (though stage times are still impacted by the momentary freezing). CPU and GPU show low load levels during the game.
Platform is Steam VR, all DLC downloaded.
Oculus Rift CV1 headset.
PC is X299, Intel 7900X cpu OC'd to 4.4 (8 cores) / 4.6 (2 cores), RTX2080ti OC'd using Precision X1 scanner, 32GB Ram, game is installed on C: drive nvme ssd, custom loop cooling CPU, GPU and VRM.
Day One edition (standard?) with all DLC.
Lots of peripherals - Thrustmaster TX servo base wheel, T3PA pedals (USB connected), TH8A shifter, Heusinkveld handbrake, BBJ button box, 2 x keyboard (1 x wireless), mouse, various sound devices, Oculus Rift (all sensors unplugged except one now for this issue), 3 screens connected in addition to the Oculus headset.
I've tried disconnecting as many USB devices as possible. I tried running Supersampling "2" and changing refresh rate manually to 90 from 60 but the config VR file returned to default settings afterwards. Resolution is 1600 x 900 in the config VR file.