well, last project was more complacated and bigger than this one, and wasn't any problems - for opening 3d window i need to wait about 40 minutes. with this project,3 days ago, i could open 3d window for 4 minutes.
i just don't understand why now, because 3 days ago, evething was ok, and the project isn't bigger now than then.
thank you a lot for your help!