I recently played with the Stealth tutorial on Unity3d website. I found Unity3D editor hung a lot on Mac OS X. When it hung, the CPU is at round 30%, Mem at around 400MB, process "Not Responding". I followed the tutorial on Windows version of the Unity3D and it worked flawlessly and much faster. I was using the same MacBook Pro for test (Bootcamp Windows vs. Mac OS X), so hardware is identical. Hardware info: 2.3G Intel i5, 8G DDR3, Intel HD 3000. Is it a bug or something I was missing?