I have got a set o 2 Deco's M4. They are on the same floor.

I am getting slow wireless speeds. My network plan is 600/25. Deco is connected via ethernet to modem. I am getting full speed wired on modem and wired deco. 

Wireless is around 90/25 on Speedtest.

But at the same time when I enter network settings in Windows and click on properties of my WiFi card I can see 866 Mbps. Is this difference significant to my case?

I read a lot of threads here and tried different tweaks to solve this problem but without success. I tried setting QoS limits to 1000/1000, clearing high priority users, changing positions of deco's, changing ethernet port and different wires.

Please help