title: Very slow tab switching in Xcode 4.5 (Mountain Lion)
body: <p>I recently updated my MacBook Pro (2.3 GHz Intel Core i5) from Lion to Mountain Lion and simultaneously upgraded Xcode to the latest 4.5 version. I've experienced one very irritating problem. While programming I'm used to have a couple of tabs opened at a time. Ever since I updated, each time I switch tabs, Xcode freezes up for a bit (a couple of seconds). Does anyone have a suggestion to solve this problem?</p>
  
  <p>I followed <a href="https://stackoverflow.com/questions/6355667/xcode-4-slow-performance">a tip</a> on deleting project.xcworkspace to improve performance. Which seamed to help, but only for a short period of time.</p>