The maximum transfer speed in data transfer mode of 2.1MB/sec is using webinterface.
I can achieve 7MB/sec (56Mbits/sec) transferring data using DCC.
As VLC is called by the webinterface I do not know whether the VLC data stream is restricted to 2.1MB/sec or not.
Any way, for me it doesn't work. If anyone has it working please let me know, or even if someone knows for sure the reason why it doesn't work that would be interesting.