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A reader that's not too dumb should not read all images in memory, it should just read the size in order to do the layout, and read the image only when it's going to be displayed on the screen. So I wouldn't care about it. But if you have thousands of images, maybe for navigation purposes it would be good to have some sections or pagebreaks, and for that you'd split the file. For instance, if I'm doing a compilation of comic strips (one image per day), I'd probably have one file per month.
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