hi,

I use a display link usb3.0 to DP adapter to extended my Macbook 12.I found the launchpad on macbook screen is ok,but on the extended monitor the launchpad is very slow.

MacOS 10.11,
Apple LED Cinema Display .

Unitek Y-3703 USB3.0 to Displayport Converter
Driver:3.1.0 (82262)

USB3.0 to displayport adapter:

Product ID: 0x4301
Vendor ID: 0x17e9 (DisplayLink (UK) Ltd.)
Version: 4.12
Serial Number: 0003360415604
Speed: Up to 5 Gb/sec
Manufacturer: DisplayLink
Location ID: 0x14510000 / 23
Current Available (mA): 1800
Current Required (mA): 126
Extra Operating Current (mA): 4