I just got Unity 3, and it's running slowly. Is there a way to try to speed it up?
Turn down your editor's quality settings. See: http://unity3d.com/support/documentation/Components/class-QualitySettings.html
Yes; optimize your game.
Remove large pieces of game to try to isolate the problem. Could be scripts are too slow or textures are too large or meshes have too many polygons or any number of things.