Arcadyan VRV9510KWAC23 poor network performance

I installed openwrt in this device (Arcadyan VRV9510KWAC23)
I set it as acces point (i set the cable in wan port ).
Connect speed is good in desktop i using port rj45 but in wireless is low is it any possible to make it good?

Please remove pictures from your post and post
ubus call system board
And tests in various confitions from

Since you use it as an AP, you shouldn't go via the WAN port, or reconfigure it.

Discover the windows snipping tool, too.

Thank you for replying, i tried your answer but i s more low and when disable DHCP i can t anymore access to settings of router by ip.

DHCP client or static IP isn't an issue, just pick one, both will work.