@Chevelle 5GHz WiFi generally won't travel far enough and 2.4GHz might reach but you're probably pushing it with equipment like Decos that feature small antennas and having them installed indoors vs...

@ImtiazAli See my updated primary post. TP-Link support confirmed that the Deco XE75 Pro doesn't support traffic stats or parental controls with IPv6 enabled :(

@TimGreiersen strange, does the issue come back if you disable QoS? shouldn't need to be on for you to get full speed

@TimGreiersen The "85-95mb/s" you report sounds suspiciously close to the limits of 100Mbps (not Gigabit / 1000Mbps) Ethernet. I'm wondering if a cable or Ethernet port somewhere is causing this...

@ampx Bumping this since I've uncovered new information

@ImtiazAli what about now?