Tobii eye tracker 5 - short delay


I have a tobbi eye tracker 5 and I have noticed there is a delay between my head movement and the reaction in the game. In other words, if I turn my head, the camera in game will turn after a short delay (like between 0.5s and 1s).
I don’t see that delay in DCS.

So, is there someone here who use it with WT? And having the same issue?