I would like to re-purpose my ACER Aspire M3920 as a NAS, using OpenMediaVault. Before doing so, I wanted to do a speed test on my LAN. So I used iperf3 on both server and client.  When I use my DELL XPS 8700 as the server, I get: 936 Mbits/sec in both directions, however when I use the ACER Aspire as the server, I only get: 399 Mbits/sec. Why should there be such a difference when I swap the server and client around? I want to test the LAN speed not the CPU speed.