The low framerate and flickering mouse disappear on 15.04 by:
- installing nonfree drivers: 
http://support.displaylink.com/knowledgebase/articles/615714#ubuntu
- systemctl start displaylink. Autostart: 
http://www.displaylink.org/forum/showpost.php?p=78036&postcount=2

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https://bugs.launchpad.net/bugs/1278223

Title:
  Mouse Flickering after adding 3rd Monitor

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