I submitted a mantis bug for the first bit I found on this, but I don't want to spam over there for something that is in placeholder status.
Two issues I'm having with it:
First, GUI response seems to be very sluggish. Tooltips are slow to pop up, vanish, or change when hovering. Clicking buttons has noticeable lag before any response (pause/unpause, turning FRD on or off, those kind of things).
Second, if I maximize the game window, many of the buttons are winding up laid out on top of each other. I'm running on a 1440P monitor. I can submit a screenshot if needed.