Images are not immediately available when we want to put them on the screen-they are usually loaded from a server. And there’s no reliable way of guessing how long that will take.
If you try to display them on a fixed timetable, most likely none of them would get a chance to load completely: the next image you try to display would clobber the one currently loading, and Netscape would start loading it again from scratch the next time it was called for.
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