RUTX50 - Poor wireless speeds

Hi,

I just bought a RUTX50 to use in my mobile home.

Now when I have configured it I´m really disappointed with the speeds I get over WiFi.
I´m using my home WiFi as WAN and then I created a new WiFi on the RUTX50.
Without Teltonika I get approx. 417 Mbit/s down and 453 Mbit/s up
With Teltonika I get approx. 74 Mbit/s down and 111 Mbit/s up

Out on my driveway in my mobile home I get:
Without Teltonika I get approx. 21 Mbit/s down and 24 Mbit/s up
With Teltonika I get approx. 1.8 Mbit/s down and 5.7 Mbit/s up

Firmware: RUTX_R_00.07.21.3
Both 2.4 and 5 GHz are used

What can I do to improve this?

//Rerozz