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I have three layers in my game, but when I tried deleting two of them the slowdown was not reduced. However if I create a test frame with lots of backdrops and 100 actives, there is no slowdown at all.
But my computer is six years old, so it can be a little weird at times. ;)
On my oldest testing PC (333mhz, win98se) I get slow downs, but it is proportional for the whole application and not just the scrolling. Yes, older computers do act weird. The challenge for me is to make application and games run fast on them. With scrolling it might be a lost cause, as that is the most dificulty with me.