Poor wifi bandwidth?

Hello,

I just bought a Fortigate 60D & FortiAP 221E. After setting up the AP and running a speed test (speedtest.net), the bandwidth when connected to the AP is significatly lower than if was connect by LAN connections.  

Speeds:

Lan = 115Mbps download

wifi = 30Mbps download (standing two feet away from AP) 

How can I get the wifi speeds to be somewhat closing to the 115Mbps? Is there some kind of throttling on that AP that I need to configure?

Thanks,