Why PS slices can improve the speed of web browsing?

   Cut into small pieces when browsing can be a piece of the load, a small piece of a small piece of the display, if not cut, on the whole of a large load of the reality, the speed is often fluctuating, if the picture is too large, loading up is not stable, of course, time is longer. and cut into small pieces, you can save the picture space, because the color of a single picture, you can use GIF format instead of JPGE, if the whole piece is a color, you do not even need to cut, you can write directly with the code. Therefore, when slicing, there is no need to cut down the whole chunk.

Why PS slices can improve the speed of web browsing?