Slow data transfer over USB

[xoomfan]

I've just plugged my Xoom into my Mac for the first time since getting 3.1 to move some files over to it. I have noticed that the transfer of data is now very slow compared to how it used to be. Has anyone else noticed the same? I'm using Android File Transfer Version 1.0 (1.0.11.9326), which I don't think has changed.