I got same problem on ux31e and  ubuntu 12.04 & kernel 3.2.0-22.

On syslog i found a lot of logs about Bad Header Length...
asix 2-1:1.0: eth0: asix_rx_fixup() Bad Header Length
asix 2-1:1.0: eth0: asix_rx_fixup() Bad RX Length 1716


So, when i copy a big file (size ~ 3,7 Gb ) from home network with 100MBps of 
capacity, my ux31e only transfers 300kB/s. 
I checked the network hardware with "sudo lshw -c network" and its says that 
support 100Mbits.


** Attachment added: "syslog-to-report.tar.gz"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/947723/+attachment/3153597/+files/syslog-to-report.tar.gz

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https://bugs.launchpad.net/bugs/947723

Title:
  ASIX USB-Ethernet driver noticably slow, dropping packets and
  reporting RX errors

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