VR is Killing me, Freezing After Preview, Low Frame Rate in VR Preview

Hello everyone, I have been working on the unreal engine program for 2 weeks. I solved each problem one by one, I am proceeding step by step. But when it comes to this vr issue, I have not much left to do. i need help There are problems that force my system for which I do not know the reason. VR does not work stably at all.

There is a constant freezing and sticking problems. I read all the documents and made every possible or possible setting. However, I have an optimization problem that I could not get out of business. Normally when using Fps when receiving more than +120 fps. When I run the VR it’s like 3 fps. When you close the preview, the computer continues to freeze.

My computer;
GTX 1080
Amd Ryzen 7 2700x
16GB Ram
ASUS TUF Gaming B450 Pro

Thanks For Helping !