Hostpot very slow

[ManuelCostanzo]

Hello, i successful installed two TPLINK T4U AC 1300, in two different computers. I created a hostpot in one computer and the other is connected to it. My problem is that when i test the speed using iperf3, the maximum value that i obtain is 13MB/S. I switch to different channels, different bands (2.4 GHz and 5GHz), but changes were worst, i have never got more than 13MB/S. Please, i need some help to solving this. Thank you very much.