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Prodigit, far as I understand azw3 is a fancy new container for the epub3 standard. Not all features of epub3 can be used on every kindle. AZW3 books that are 4-6 mb big are unnecessary large. Not sure if that is calibres fault or bad source material to begin with. My LOTR azw3 (the new version) including x-ray is 3.75 mb big. No other normal book should be that big if done right. Sure, graphic novels can get huge - not counting them then.
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