Quote:
Originally Posted by Magic815
Is there a way to split it, convert each piece to KFX, and then re-merge back into one KFX file?
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There is no way to merge KFX files.
Quote:
Originally Posted by Magic815
I'm not a programmer, but is there anything that can be done in the conversion algorithm to allow for better efficiency at higher page counts?
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The problem of slow conversion is rare enough that it has not been investigated, at least not by me. Slow conversions happen even when KFX isn't involved so at least some of the problem lies with calibre's conversion infrastructure.
The KFX Output plugin has a CLI mode that bypasses most of the work done by calibre. You could try using that on your book and see if it is able to perform the conversion in a more reasonable amount of time. See the first post in this thread for instructions.
Quote:
Originally Posted by Magic815
Have you determined what the max book size ends up being for you with conversion times that stay reasonable?
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It appears to have more to do with the complexity of HTML markup and styles than actual size.