I use the 2.4GHz or 5GHz frequency on my "repeater" (a TP-LINK Archer C7), connected to my main router (another TP-LINK Archer C7), using the other radio for WiFi. The Internet just feels slow! The latency seems poor and often the bandwidth is extremely variable.
And yet when I connect via ethernet to the repeater, the Internet feels fast and zippy and no bandwidth issues. What is going on here?