Topic: Game Programming / smooth scrolling without lag in a tile based game...
There seems to be a fairly widespread belief that lag in flash apps is mostly caused by flash’s slow garbage collector – I don’t know if that’s actually true, but you might try structuring your code so that you don’t create any new objects while the game is running (instead just reuse old data structures, etc). I’ve heard that this is how FLIXEL works, and it doesn’t seem to have any problems with lag.