Are you working with ONE HUGE (body) Segment? That will really slow things down. (and that is on a 64 bit system with lots of RAM). Breaking (splitting) it is really a good thing as everything goes faster (an that includes the end users reader) with smaller chunks.
Since EPUB is really just a Zip up bunch of text files (HTML and the lot are plain txt) Un-zip (there is a Unpack tool that will keep the proper EPUB structure upon repacking THE SESSION) the book and use whatever editor you want . Notepad++ comes to mind, since it IS a good CODE style editor
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