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Ah,
It is the split function that is taking all the time and not the unpacking. When splitting to get a mobi 7 you are basically removing the mobi 8 part at the end but not playing with the images / graphics sections at all in the mobi container. When splitting out a mobi 8 you have to remove the text of the mobi 7 section and then copy all of the graphical image sections to put them back into the right place to create a proper mobi 8 since all image/graphics sections are only stored in the old mobi 7 sections to prevent their duplication.
So yes I would expect to see much longer times for mobi 8 s in the case.
KevinH
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