[OS X] UI extremely slow/laggy while game window smooth as butter.

I wonder if you run your UI in a separate low-priority thread or something. The game runs really well on my potato, but for some reason the UI is quite unusable. Most noticeably, the mouse-hover icons and the pop-ups are completely lagged. Sometimes they'll appear at the wrong place and then move where they are supposed to be. It's really hard to play

I would screen cap, but my toaster can't take it.

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OS X Yosemite, v0.3.6473