actionscript 3 - Is it possible to remove an instance of an object from memory and restore it later in as3? -

my question bit vague let me elaborate. i'm beginner programmer working on first flash game point of question side-scrolling platformer mario example. unlike traditional platformer though, level continue indefinitely until player dies or quits game. level tilebased , generated automatically through array specifies object in each tile( or 0 if there no object). in order ensure game doesn't automatically crash excessive objects generate more of map( creating new instances of objects) player progresses player move right map generated past edge of screen.

now matter @ hand, i'm guessing once player gets point in game start slow down because more , more objects being created. assume solution problem remove instances left of screen player progresses problem need player have ability go through level.

so question is: how can 'delete' or remove instances memory, game doesn't slow down, restore instance when player moves proximity of instance (or was).

note: aside player object have in game 'wall' object instances of stored in 'wallarray' array use reference instances of wall collision detection

see comment, either way may same answer. read on sharedobject class , simple experiments using sharedobjects write info objects disk, , read info back.