Poor Wifi signal quality under load?

Question

Iron

Good afternoon dear ones.
There is a problem with the wifi adapter and router.
Wifi adapter - USB Tenda W322U.
Router: Edimax
The problem is this, the speed runs from 150 mb to 27 mb. It costs 40 - 27mb.
In this case, the ping grows by 6-8 times. Packets are lost.
Checked on USB 3.0 the same thing. The router is in another room, I already sent it to the adapter as best I can, it helps. But an hour later he jumps again.
What options do you offer?
Checked on different devices from this point where the PC is located.
Everything is fine, it is the PC that carries such crap.
I am attaching a video with the inssider test. I
also ask that you pay attention to the quality.
That is what increases the ping.

Answer 1

https://www.youtube.com/watch?v=FCM8xUuvL10