So I'm having this issue with the really slow download speed and very fast download speed over cable and wifi. The network topology is the following:
Provider router and FO media converter (PON-TECH PT-47RW) in bridge mode => Asus AC-RT66U router (connected to lan 1 from provider router).
The speed tests I have done are the following:
laptop connected over cable to provider router - (73.44 Mbps download / 72.83 Mbps upload) http://www.speedtest.net/result/6983140310
laptop connected over cable to my asus router - (9.36 Mbps download / 64.59 Mbps upload) http://www.speedtest.net/result/6983164758
laptop connected over wifi to my asus router - (13.19 Mbps download / 42.59 Mbps upload) http://www.speedtest.net/result/6983158870
I have already tried other suggestions from various forums like turning off the firewall or WMM but that didn't help. I have also ran the tests using an old tplink TL-WR940N router and here's what I got:
laptop connected over wifi to my tp link - (21.81 Mbps download / 10.76 Mbps uplpoad) http://www.speedtest.net/result/6983146621
laptop connected over cable to my tp link - (12.51 Mbps download / 10.65 Mbps upload) http://www.speedtest.net/result/6983153018
The download speed over wifi is slighly faster but on cable is the same...
What could the problem be?
Summary
cable provider router - 73.44 Mbps download / 72.83
cable asus router - 9.36 Mbps download / 64.59 Mbps upload
wifi asus router - 13.19 Mbps download / 42.59 Mbps upload
cable tp-link router - 21.81 Mbps download / 10.76 Mbps
wifi tp-link router - 12.51 Mbps download / 10.65 Mbps