Thanks for reply. I agree with you.
This problem occurs in all games (Steam VR, Video Mode) and only when moving head.
It is not a FPS problems. Also in movies with the stationary head the problem does not occur.
Pimax 4k was tried on two different PC (Intel i7 + AMD RX 480 + SSD, Intel i7 + nVidia 1080 GTX + SSD) but with some result.
With oculus and vive (Tested on Intel i7 + nVidia 1080 GTX + SSD) no problem.
At present Pimax is valid only for 3D videos.