I have just installed gigabit fibre into the house and am getting 970mbps - 1.2 gbps into all devices with an installed ethernet cable.  I'm using Cat 6 and have checked the cable coming into the main M5 unit and the speed at that inbound cable is gigabit I also have a cable coming out of the M5 to an xbox and that is also getting  gigabit speeds. 

The wifi however is only 100-110mbps coming out of the M5.  This is the same regardless of having just 1 M5 or the main M5 and 1 satellite M5.

I have isolated the M5 by unplugging the xbox cable and the wifi performance is still limited to 100-110mbps.  The M5 was in the house before the fibre, so I also deleted the old network from the Deco and started with a fresh network, still no difference - it's limited to 100-110mbps.

Please advise on how to get faster wifi speeds from the M5.