@MartinBG You could try making other X20 Main Deco, but I am out of ideas. Everything seem to be setup properly, yet speeds are not what one would expect from WiFi6 WiFi mesh. Deco X20 is budget...

@mryan143 See Q6 of the following TP-Link FAQ: General questions about Ethernet Backhaul feature on your Deco

@MartinBG 1.2Gbps link speed is what should be for X20 on WiFi6. Running Deco mesh in Access Point mode removes all possibilities of traffic throttling by Deco settings. Powering off Satellite Decos...

@berne Keep router TP-Link AXE5400 as is. Just turn off router's WiFi. No other changes required on router.

@alfie012 There are no configuration settings in X55 for Ethernet link speed. X55 comes with gigabit Ethernet ports. Try different Ethernet cable(s), and/or return Deco X55 to the seller.

@Smats Deco M5 has a set of quite nice features that you might lose if adding another Deco model. Do you use the following with your Deco mesh: 1. "Test Internet Speed" button in Deco app; 2. IoT...