Networking – Slow Download – fast upload on cable and wifi

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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

Best Answer

In your ASUS Router Web Interface, under the Traffic Manager side menu item, is QoS enabled? if so, there are probably upload and download bandwidth fields. This could be the cause of your un-even throughput. Just turn off QoS on your ASUS router and run your test again. This is just an assumption because I don't have your router configuration file in front of me.

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