Using a 2015 MBP with Dell U2414H monitor via HDMI. If I have my logitech unify receiver connected to monitor which then connects to MBP via factory USB3 cable, the mouse cursor lags but keyboard is fine...More specifically the Trackball M570 and Performance MX and MK710 Keyboard.
If I connected logitech receiver directly to the MBP, no issue at all...
Just wonder if anyone has experience troubleshooting this kinda of issue?
MacBook Pro with Retina display, OS X El Capitan (10.11.1)