Hi TP-LINK Support, In new version of app with M9 you can see client connection speed, why in other models no?

This speed test you made on Deco APP?

First you need configure all decos via wifi, one main Deco with cable at router and all other units via wifi. After this. turn off 2nd unit and wire, turn on and "voiala"

you have others routers into your network? if yes, check if DHCP is off.

No, use OMADA for that.

yes. Deco can arrange you network. But don't work if you have IPTV via VLAN. Deco only support one VLAN. I have this case in my network and i remove my provider modem and use Archer C7 as main...