Bandwidth problem

Hi!

First, sorry my english. I’m new in mikrotik. I have a mikrotik over my head (this is my own). This connect to another ap. I connect to my ap via ethernet. In my ap there is: tx/rx rate 11Mbps/2Mbps but my ethernet pc bandwith like 28k modem. It’s very slow.
What can i setting?
Why is this limit?

Thansk…