Mikrotik RB962UIGS wifi speed problem

I have Mikrotik RB962UIGS and wifi speed problem.
My connection WAN is 100 Mbit/s and cable LAN speed is OK about 98 Mbit/s.
I have my MacBook Pro 13 2017 connected to this Mikrotik 5GHz and my connect is good condition.
I have max only 75-80 Mbit/s I don’t know why… my MacBook I have 2 meters from Mikrotik.

Maybe someone will tell me how to fix it so that I would have about 100Mbit/s after wifi?

Bring it further away. Try other wifi frequency in settings. Make sure you have all 3 chains enabled.

This is my 5GHz configuration: https://postimg.cc/gallery/1rjz2x9u6/

Turn off auto frequency. Select fixed channel, e.g. 5180 MHz.
Don’t use 802.11a mode if you don’t must. Set n and ac.

It will be ok?

https://i.postimg.cc/zf3WNZ4D/4mt.png

Yes, now the settings are correct. If it still goes wrong, try changing the width or channel (frequency).

Ok but 20/40/80 Ceee will be good?

Such a connection should 100 Mbit/s without a problem like that?

This setting is good in itself. It all depends on the use of channels in your area.
I use the 20/40 ce channel in 802.11n mode and at 100Mbit/s from the provider I reach 96 - 97 Mbit/s.

I don’t have 5GHz networks in my area so I should have about 100 Mbit/s wifi speed no problem… I check it when will be in home, thanks.

I check and I have about 75-80 Mbit/s all time… I don’t know why…

See http://forum.mikrotik.com/t/hap-ac-5ghz-max-speed/117852/5

I tried different settings but all the time I have max 75-80 Mbit/s.
I don’t know why…
I went with the Macbook next to Mikrotik and all time I have the same.

Wired connection I have 98-100 Mbit/s.