My brand new adapter doesn't go faster than 40 Mbps on my 240Mbps 5ghz internet. My PC sits less than 3 meters away from the router and when I connect the adapter on my laptop it goes to 90 Mbps witho

Hi, I've bought Archer T2U AC600 (USB Wifi Adapter). It arrived, I've followed the guide on how to setup it. I've installed drivers that required for it to work. Somehow, when I use it the speed test