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As DNSB said, some publishers like to put HUGE images in ebooks, which are generally useless unless you're reading on your desktop or tablet. There's no reason a well-done image needs to be larger than your screen resolution, yet I often buy books that have multiple oversized covers and images over 2.5MB each. A well-done compression will look identical when viewed on your e-ink screen. Of course if you open the images on your PC and zoom in, you will notice differences and some pixelation, but that's not visible on an e-ink screen that supports a max of 1024x768, and often 800x600.
The other thing is check the books for embedded fonts. I really wish publishers would stop insisting on what font we view since one of the main advantages of ereaders is letting people switch font styles and sizes to accommodate their eyesight. The size difference per book will be between 2.5-4MB with embedded fonts, and once you remove the embedded fonts it will drop down to a normal size of 250-600KB.
Both are nothing but a huge waste of space to me and I always remove both before transferring books to my ereaders.
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