FPS in Vive Focus in empty proj = 30!!!! WTF

We try to adjust fps above 20 in our project and then try empty one and got only 30!!! Does it normal? Or it must be x2 greater?.. I’m confused. Almost nothing in inetrnet about this device and so much pain with it… Processing with Oculus Go was much easier than with Focus. Very disapointed with it…