title: iOS Storyboard lags and won't open
body: <p>I have a project that isn't too huge, it has maybe 6-7 different class files and 5 view controllers. However when I try to open the Main.storyboard, Xcode 6 freezes and lags. I'm running an Intel i7 4770k and gtx 780, so my computer should be able to handle something as simple as this. I can open all the class files and everything else fine.</p>
  
  <p>Here is an image of the problem
  <img src="https://i.stack.imgur.com/lEeSs.png" alt="enter image description here"></p>
  
  <p>I get "Application not responding", and I can open the storyboard on other projects.</p>