Current state of off-screen objects handling

Hello,
recently, I started to develop a tile-based game.
Soon, I asked following questions:

  1. Is it common in Corona to prepare the whole level in advance? - e.g. create 500 display objects with physics at once (when some “loading screen” is shown to user)
  2. What’s the impact of creation of hundreds (or even more) such objects on performance?
  3. Does Corona provide any built-in mechanisms that handle possible problems for me? - e.g. not checking physics collisions on objects that are off-screen? not playing sprites that are off-screen? etc.

I went through the forum and found several topics( e.g. Off Screen Culling) to questions 2 and 3, but from none of those threads I was able to say what’s current state ( as of July 2012 ) of support in Corona for such things. Can anyone with enough insight into this provide sum-up of this issue? [import]uid: 164599 topic_id: 28926 reply_id: 328926[/import]