@Philbert Thanks for the detailed answer! I will check with some wifi analyzer....

Every time (even few minutes) I perform Network Optimization I get the message: Your current WIFI channel is congested. However, all 3 deco M5 units are connected via ethernet cable (1G). The deco is...

Just to add that my maximum speed is 200Mbps. So I do expect to get high speed on the satellite M5 via wifi....

@David-TP Thanks David to your swift reply! Following your answer I've been able to get maximum speed, but I also have several questions :-) 1. How do I measure Ethernet speed of a specific satellite...

@TP-Link When my laptop is connected to the main Deco M5 device, I get full speed (per my subscription): 200MB download, 5MB upload. When it is connected to a secondary device, performace goes down...