I tested Mango 3.215 firmware, as wireguard client download speed is more than 35Mbps. I use iperf3 to test. Please choose the same server if you are using speedtest.net to test. @ajj81
As wireguard server, the throughput will be halved. Because the data come in and out from wan port when using wireguard tunnel. Quit different from wireguard client. @virtu789