xcode 6 interface builder very slow performance when showing viewcontrollers with constraints

Question

I have an problem with Xcode 6 really responding very slowly to user interactions, e.g. editing code, scrolling areas etc. This particularly happens when the interface builder s

Answer 1

Do you use an external monitor? If yes, probably that's the problem. Try moving to the main macbook screen and try again.

That solved the problem for me.

EDIT: sorry, just read you have an external monitor. So yes, move to the main screen and check if that solves the problem.

EDIT 2: seems like Apple fixed the problem, no more issues using my external monitor!

EDIT 3: meh! Problem persists, not sure why it stopped happening, and happens again now.