I'm not seeing this issue since installing the USB3 drivers. I get about 4-6% CPU usage from the DisplayLink processes during normal use and it does peak around 10% as you say when moving windows around - but nothing as high as you mentioned.
Currently configured:
Latest Intel USB3 eXtensible Host Controller drivers
https://downloadcenter.intel.com/Det...usb+3.0+driver
Latest Lenovo Dock firmware
http://download.lenovo.com/ibmdl/pub...updatetool.exe
Latest DisplayLink Drivers
http://www.displaylink.com/support/sla.php?fileid=93
There is some info on Intel's website about forcing USB 3 support in the BIOS if you have problems with devices running at USB 2.0 speeds. The Lenovo has an option for USB 3 in the bios which is "Auto, Enabled, Disabled" and 'Auto' is default. You could try setting it to Enable which forces USB 3.0 mode.