I have got 2x USB 3.0 RTL8156 ethernet dongles using one on my Rockpi4 the other windows client   If the rockpi4 is the server speeds are awful    [rock@rockpi4 ~]$ iperf3 -s ----------------------------------------------------------- Server listening on 5201 ----------------------------------------------------------- Accepted connection from 192.168.1.12, port 52620 [  5] local 192.168.1.9 port 5201 connected to 192.168.1.12 port 52621 [ ID] Interval           Transfer     Bi