i posted this exact problem a few months ago and the solution I got made perfect, logical sense. But it had to be wrong...
I'm running Windows 10 with a motorola surfboard 6141. Ethernet connected I get about 92 Mbps/12 Mbps consistently.
In that post a few months ago I purchased and installed the TP-Link Archer C7 AC1750. On wifi with that unit I get speeds just about 2 -3% slower both up and down. So that's fine.
With Ethernet running through the router, speeds drop by around 75%. I posted here and got the advice that all 4 ports were bad on the router. That is statistically impossible 4 months later with another new router.
I'm googling and getting things like turn off QOS. Screw around with NAT. None of which sound like fun.
Any help here would be greatly appreciated.
Thanks and have a good one!!
Edited by Mklangelo, 15 April 2017 - 02:47 PM.