I have 2 Deco X10's.

Fibre connection 200mbps

Main is connected to my router "with cable supplied".

Satellite is connected by cat6 to the Main.

App shows the Satellite backhaul is conntected by LAN to the Main.

1 SSID setup

Main is only getting 40mbps

Sattelite is getting 200mbps

QOS is set to 1000

Have tried changing the main and same result.

Why is the main WiFi so slow,  they all should be the same speed as all connected by cable together.

Please advise how to fix this.