This happens on my system as well (Surface Pro 1 + TOSHIBA dynadock). I tried version 7.9.95.0 of DisplayLink Manager.
It's especially apparent when moving windows between monitors. Usually it's much worse after a full day of work. After a restart, and with non-maximized windows (window shadows sometimes leak onto the next screen) the performance is acceptable.
But the system usually suddenly becomes almost ununsable:
- Typing in Outlook (even on main screen) comes to a crawl (1 character/second)
- Mouse cursor movements become very jerky
- Simple things that are usually completed within milliseconds now suddenly take multiple seconds
Task manager shows low CPU usage, but the fans spin up nonetheless.