Using a 4k monitor with Ubuntu for the first time. Seeing some lag and I am wondering which component(s) are the cause. - Resolution is set to 3840x2160 and Ubuntu scaling preference set to 1.4.

I've been using my netbook for work much more than I thought I would so I decided to pick up an old 19" TFT to plug in. Overall it "works" but the main issue is that the launcher is on one monitor but ...