Strange error oculus performance

Hello everyone, sorry for my knowledge of English.

I've been trying to solve performance problems for a week now. I have a simple location taken from assets unity store. I also use oculus unity integration. Unity version 2018 3.14f1.

Screenshot Links;
https://ibb.co/tx5DBn4
https://ibb.co/tMSt0Pw
https://ibb.co/Ln7MmK0

Also a similar problem is described here:
https://forum.unity.com/threads/vive-vr-spikes-how-to-interpret-vr-waitforgpu.427175/


Why such a low performance? What kind of vr.waitforgpu is it that spends all the time?
Help me please!