Tried Ethernet as well as Wifi connected to the Main Deco including different devices with the same result >>I get a short peak of 10+Mbs and then it rapidly winds down to about 5Mbs or below. In the...

Over the years I kept upgrading my Deco Mesh, which started out with three M5 units, for better Wifi coverage for a 1000sqm area with brick and reinforced concrete walls. I kept upgrading These days...