Oculus Quest & Link lagging like Crazy!

When I try to connect the Quest to my computer with Link cable, and open the "Link Room"/connect Link, it starts to lag like crazy!!
I have not even  pressed the Desktop button yet, which result in even worse lagging and ultimately hang.

I want to connect to Unity to test my development in Unity, but it does not work.
Is there a driver or something for Quest? Or what else can be the reason for the super lag in Link mode?

I have new hardware that is more than the requirements for Quest, even for Rift S:
- Oculus Quest with original Oculus Link cable
- Gaming PC with Nvidia RTX 2060, 16GB ram, SSD, Ryzen 7 4000 Series, Win 10
- Updated with latest Oculus version on PC & Quest
So something must be very wrong somewhere, question is what? 

Any help would be very appreciated, thanks:)