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So for a while I've noticed that sometimes my scenes become slow to start when I hit play in the editor. And I also noticed that if I just make a new scene and put the same stuff in it as the previous scene had, it will start fast again. Well just now I narrowed it down to something more specific. I have a prototype scene that looks something like this: So not horribly complex, but not completely trivial either. Note that the level geometry, as in the orange ground level and the grey "buildings" are all a single mesh. Let me know if it is a known issue that large meshes cause problems. So anyways, If I put that into a new scene as a prefab, it starts quickly just fine. But if I then do a change to it, just something small, like extrude a face, the editor starts to freeze for a couple of seconds between actions and playmode starting will be slow as well. I noticed that if I disable the gameobject, the play mode starts slow, but if I remove it from the scene, it will start fast again. For reference, my computer specs: i5 3570k @ 4.1Ghz, GTX 670 Windforce 3, 8GB Ram, Unity installed on an SSD drive. (Note, my Windows temporary folder is on another drive which is not an SSD, in case that plays a role.)

- Windows 10 x64 - Unity 5.2.2f1 Personal - ProBuilder 2.4.8f1 When I select a ProBuilder object, I must wait 2 seconds before it is actually selected. If I need to select 10 objects, it's 20 seconds to wait. But after the selection is done, I can select it again without waiting anymore. If I load another scene and come back to the first scene, I need to wait again with each selection. In white, Unity 3d objects. In grey, ProBuilder objects.