802.11n is capable of much faster throughput than 10Mbit/s. It says here (http://www.speedguide.net/faq/what-is-the-actual-real-life-speed-of-wireless-374) 40-50Mbit/s typical, which I think is about right.
For the test above I used a TP-LINK TD-W8968 wi-fi(n) router with all default settings. All default settings on the Q10 also. The distance between router and Q10 was about 3m, through a ceiling.
I think the difference in our results comes from me measuring speed copying across a Samba network, whilst you are using an internet speed measure tool. The internet tool gets it's test data from the internet so brings into play other factors like your broadband speed and the ability of the web browser in the Q10 to process incoming data through the (likely flash) testing web app.
My test is a more pure test of the wifi capability of the Q10! If you're using the Q10 to play high bitrate files from a local network (as most people are) then raw Samba throughout is most important.
I would guess that the slower rate you're getting is due to a bottleneck in the way data is processed in the web browser you use in the Q10. You may get different results across different browsers (Chrome, Dolphin etc). Different results would tend to confirm this as the bottleneck.