I asked a similar question in 'SO' not knowing about this place,anyways here goes:
I wanted to know what the best approaches are while creating a platformer based game for handling background & objects.
Tiled method - Using small objects & loading on-the-fly : I understand this is good for employing a level editor for the game later but wouldn't it become too processor intensive to manage so many tiles(using arrays, i assume). Especially if have many objects which also might be mutually exclusive (eg different sets of bg objects which react differently to user). Please throw some light on what usually the tile sizes often considered. I have a doubt that I used too small tiles which reduced my frame rate drastically.
Create, store & scale: Creating the whole level & storing them in separate movie clips, scaling them while the level loads. I found this method could solve the frame rate problem, but I then had to handle the issue of not being able to place objects (like enemy, power ups, etc) during runtime, as I no longer tracked the exact locations of the player (hero) in the game.