@BugBear Something is wrong with that Dell laptop. Could be something bad: spyware, hidden VPN running on background. Could have been corporate installed software to manage and monitor access, but...

@MrMareng In TP-Link FAQ articles, you can expand "This Article Applies to," to see the list of Deco models to which article applies. Click on that tiny blue arrow pointing down, and see if Deco M4...

@NotARobot I have two M9s in my Deco mesh: one is Main and another is Satellite, uses wireless backhaul. Let's compare our Deco mesh systems performance. This is what I have. Deco M9 Plus, firmware...

@ilansz TP-Link suggests using M5 as Main Deco, if to choose between M5 and M4. The order of preference in choosing Main Deco between different Deco hardware models is provided in the following FAQ...

@yewnity I am consistently getting 200-250Mbps on Satellite M5 when it is connected to Main Deco by WiFi backhaul. My Satellite and Main are on different floors of the house, separated by wooden...

@MarkKL You can add M4 to your mesh as Satellite Deco, and after that make it Main Deco. Your current Main E4 will become Satellite Deco and you can move it to a different place, or you can remove E4...