>>293238350
Have you tried restarting your pc?
That sounds like the old incompatibility issue that steamVR and oculus dash have from time to time.
This happens in any VR game.

Check the SteamVR settings as well if the Video feed is properly size. SteamVR sometimes overshoots and doubles the pixels size of Oculus rift in their system in what essentially is a super-sampling of 2.
That will lag the shit out of you.