I have a internet connection with a download above 100Mbps, I am using an RT-N66U with Shibby's Tomato Mod(110). 1 computer(100Mpbs) when connected via the router downloads at about 55Mbps, but when connected directly to the modem is can download at about 95Mbps. Other computers including Wifi connected computers can reach full speed using the same cable. I have changed the cable, and but still receive the same speed. I don't have QOS enabled, and tried using Cut-Through feature.
Any clue as to what the issue might be?