I tried to restrain myself from writing this kind of topics but... no longer. Since I have upgraded my OSX to Mavericks, and Unity to version 4.3, the software is literally impossible to use. It freezes and feels sluggish ALL the time: - When compiling new scrips - When hitting Play button - When moving into Full Screen mode - When moving between desktops - Debugging the code freezes the whole software and stays like that forever. Also, I need to mention that my machine is decent. Nothing fancy (iMac 2011), but before an upgrade, both OS and Unity worked like a charm. I know that there is already a ticket on the Issue Tracker, but all the Unity Mavericks community awaits impatiently for any update in this matter from Unity Team. For how long the software will remain unusable? I use Unity for university projects as well as my own, private ones, but this breakdown slows my workflow dramatically - each test cycle takes forever, and I cannot debug at all! I have paid lots of money for the top software - there are, however, high expectations going along with that price. Unity, when?