When I changed the computer (and the operating system of course), I have a problem with going into Play Mode. It lasts too long, about 30 min or even longer. It's true my project is very big (80 GB), but shouldn't it be faster? I didn't have such troubles on my old Windows 7 32 bit but on Windows 8.1 64 bit system. I have no Resources/resources folders (i changed their names to load scenes quicker). This problem was with Unity 4.6 and installing Unity 5.0 hasn't solve the problem. I wrote about that on Answers and the problem is still unsolved: http://answers.unity3d.com/questions/816177/memory-leak-in-play-mode.html When I try to run an empty project, going into Play Mode is quick. I realize it is due to my big project but I don't know why. What exactly is loading during runtime? I didn't experience such a problem on my old Windows 7 32 bit. The scenes were loaded quickly. Waiting for being in Play Mode is really irritating. Do you use Windows 8/8.1 64 bit? Do you have such problem?