VR FPS drop and lock to 40 fps Oculus rift s

[Anonymous]

when I open a scene and switch to display through oculus rift s my fps is around 120 but as soon as the sensor in the oculus is triggered which activates the screen I get an FPS drop to a consistent 40 FPS.

I have tried this on 2 different pc's and a gaming laptop, although the max FPS is different with al 3 computers the drop always goes to 40 FPS.

Other programs for the oculus run smooth without any problems. I have also tested if the same thing would happen when I tried this with a scene with just 2  square blocks and exactly the same happend, the max FPS in this scene was around 260.

I tried disabling the Asynchronous Spacewarp but unfortunately this didn't solve the problem. 

Anti aliasing and raytracing are both disabled. 

Graphic gard:  NVIDIA Geforce RTX 2060

CPU:  Intel Core i5-8500