@JSchnee21 But client which I use for testing is connected to 80, and I can see this from the client.

i would suggest to stay away from all Mediatek crap, there is a lot of issues with this chippset.

very disappointed in performance, my old Asus which can do 300 Mbits performs better then this AP in terms of wifi5

already tried to decrease power on 5 GHz, same results....

Seems doing some iperf3 tests on wifi5 speed is very low, on wifi 6 it also decreased - previously ~800 Mbits/sec was no problems. Now speed on wifi6 ony ~ 500 Mbits/sec and on wifi5 it start from 60...

Seems speed somehow decreased..... after reboot lower numbers as well. All the same apart 2nd EAP660 connected and it performs not so good....... tried to lower power on 5Ghz, no luck. Client count...