I ran into an issue using my Dell USB 3.0 dock when I upgraded to Ubuntu 16.10 on my Dell XPS-13. I was getting ~1 FPS using the DisplayLink driver. I ended up having to turn off VSync. Hopefully DisplayLink releases an update soon to fix this.

/etc/X11/xorg.conf.d/20-intel.conf:

Section 'Device' Identifier 'Intel Graphics'
Driver 'intel'
Option 'VSync' 'false'
EndSection