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Sigil has a merge and split function.
Once you get it to open in Sigil:
- Use the search and replace function mentioned above to insert the <hr class="sigil_split_marker" /> markers at your desired locations
- highlight all the files in the Book Browser, right click and select merge... you will have one very large file
- Select F6 (or Edit/Split at Markers) and Sigil will re-split the document at your marked locations
Although I would certainly listen to salamandarjuice's advice and check that your css/html is not overly complex....I've seen some very heinous code-bloat created by software programs that you would think are better than that.
Eliminating complex html/css can drastically reduce the number of "pages" - but I would still look at your images. Even maps can be losslessly reduced significantly. I get very good results with cover images that are 1600 x 600-ish pixels at around 200KB or less.
Cheers,
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