Default Planes Highlight Lag

Good Morning folks,

I've just been moved to a new system, and while working I've noticed a annoying aspect of my new setup:

The mouseover highlight of any plane takes nearly a second; each edge visibly highlights in order before the plane is highlighted. I'm certain this is just a video setting that I need to tweak, but I'm not sure where to go from here, and it's making my life very difficult.

My system specs at a glance (w/ Intel HD Graphics 4600 graphics card):

Thanks for your help!

-Rob Wasik