Dual monitor issue

i run dual monitors, and only use second one to watch stuff, like youtube, netflix and the like. When im in the menus, what ever video im playing stutters and skips, works just fine in game, it only happens when in the main menu. Running 1080p, borderless windowed, have not tried full screen though

I have the same problem in update 1. It really gets better in fullscreen mode (framerate in the game and everything on the second monitor jumps up). BUT: when I am in fullscreen, every click outside of the game minimizes the game. Extremely frustrating when watching a tutorial on the second screen and having to switch a lot beween the two sides.
Also perhaps related: mouse-scrolling on the second screen zooms the game.
But all small errors aside: what a great game. Thanks a lot :-)