Ah ok that's good then. Or another idea is that you can do like what they did in Mario RPG and design your maps so the higher stuff is always behind. As for the tilemappers above, they all run at SE speed. The reason why the xLIB one runs this fast is because all the author does is scrolling up/down and only draw one single row of tiles per frame. Also another reason why it's so fast is that it was written by Builderboy.