@Drano44 Make sure that flow control is enabled on all ports in the port configuration settings. This was what did it for me, I was getting 115 Mbps on my cable modem, but only 40 to 45 Mbps from a...

I setup the TL-R600 recently and was getting terrible speedtests, 40 Mbps when I was getting 115 Mbps at the modem. I noticed that flow control was not enabled on the ports, so I enabled flow control...