a tile lets you create a lot of background effect with only a little graphic, which may make a difference if you have a lot of backgrounds, and want to host the game download somewhere...
Of course, the tile has to be processed, but people often have powerful computers that can handle that easily. If you keep your game files to as least Kb as possible, 56Kers appreciate it on the download, not everyone has broadband :)
When using tiles, think about using CreateImage to create a separate "ScreenPic" where all the background effects are drawn to. Draw the background and stuff to the ScreenPic, which you only have to do once, rather than every time through the game loop. The ScreenPic is drawn every game loop instead.
Of course, the tile has to be processed, but people often have powerful computers that can handle that easily. If you keep your game files to as least Kb as possible, 56Kers appreciate it on the download, not everyone has broadband :)
When using tiles, think about using CreateImage to create a separate "ScreenPic" where all the background effects are drawn to. Draw the background and stuff to the ScreenPic, which you only have to do once, rather than every time through the game loop. The ScreenPic is drawn every game loop instead.