File size is related to the number of sprites, and to the file size of each sprite. Consider displaying a spinning globe in the Macromedia Flash Player, made up of a sequence of prerendered globe snapshots: If there are fewer snapshots then the file size will be smaller... a six-image loop will download faster than a smoother twelve-image loop. If the globe is rendered as pixels then file size will increase with screen area; if the globe is rendered as vectors then file size will increase with detail.