@glencandle 

I assume you can reproduce that on the main Deco unit, and you are using the same cable to test on your cable modem and you Deco unit.

To diagnose, I suggest swapping the ports on the main Deco, connecting the modem to the other port of the main Deco.

yves_b wrote

  @glencandle 

I assume you can reproduce that on the main Deco unit, and you are using the same cable to test on your cable modem and you Deco unit.

To diagnose, I suggest swapping the ports on the main Deco, connecting the modem to the other port of the main Deco.

  @yves_b I have done all of that but the results are the same. 

For whatever reason the Deco maxes out at 120Mbps when connected to PC/Mac using Ethernet, but I can get reads up to 250Mbps when connecting to same unit via Wifi. 

It's frustrating because I'm trying to clean up my mesh network so that all my PC's/TV's are wired, but I guess I'm going to have to go old school and just wire everthing up from a router through the walls/attic.