Thank you for your answer. Unfortunately I have Intel CPU nonetheless I tried a battle with 1 core(it was horrible ) and I checked the over clocking of CPU and GPU, but I am using factory settings.
From my point of view the software is absolutely a black box, but I tried to find a solution and tested a lot of things. For example driver updates (vga, audio, network adapter), different network route to wg servers, stopping non essential services and so on.
So far nothing has helped.