Asynchronous Reprojection causes high latency and makes games look like they are running in slow motion.
VRto3D forcible disables it for any Steam Game, but does not handle non-Steam games.
This is the manual way to disable it. It has to be done for any non-Steam game - it’s not global unfortunately.
SteamVR Status Window
Video
tab and click Per-App Video Settings
Use Legacy Reprojection Mode
to On