@paolonata I'm also experiencing this one. Once I'm connected to Slave (Satellite) Deco, My connection is way lower than the main deco. My slave deco is connected via LAN Cat 6 Cable to main deco so...

I have 2 Pack Deco M4 and I'm experiencing slow speed on 2nd unit. My modem and the Main deco have the same speed of 50 Mbps but when I'm connected to 2nd unit, I'm only getting less than 1 Mbps...