Start objects "Sleeping"

Is there a way to have an object start off at rest? for example, I have a huge level with many actors on it. When I start the level the frame rate is low, but after I give it time to do the physics and the actors become sleeping, the frame rate shoots back up. If I could have the objects start off sleeping, then there wouldn’t be the slow down in the beginning.

No one can answer?

have you tryed suspending dynamics on the first frame and then restoring later?