Ok Thanks.For local files I'm using wired Ethernet 10/100.
My mini m8s ii have wireless N
N is faster than wired 100mb/s?
I'm afraid you've been fooled by marketing - N is capable of 150/300Mbps but in reality, you'll never get anywhere near that. Is your router in single mode (20mhz) or dual mode (40mhz). If single mode, you'll be lucky to get a link speed of 72Mbps, in dual 120Mbps.
Depending on where your box is located (How far from the router, inside a case, behind the TV etc, the Wifi reception will be reduced - your box also has a very small antenna so speed will also be reduced.
Those figures are only the link speed, NOT what you can expect.
Too see the current link speed from your box ssh into your box and run
To test internet speed run this:
Run them a number of times and see how and when things change.
In my setup, I bought a Wifi extender with ethernet (which bypass the internal wifi) and I get around 48Mbps, on Wifi i'm lucky to get 5Mbps