I was using Archer AX20 as wifi router that is able to have 300 Mbps.

Recently I change to Deco M4 with the same environment and cable but found out the speed is always less than 100 Mbps. I connect to laptop with ethernet cable has the same result.

Why is it? As I understand M4 shouldn't have this limitation

QoS is disabled

Attached is the router setting (sorry not English, didn't find where to change language)