Frenzie, For the book I tested the cr3cache file for it is 5.8MB, which is certainly larger than some other cache files for more "standard" sized books.
The scrambled EPub is shared here; as far as I can tell the HTML appears straight-forward, but perhaps the large number of documents or the large number of footnotes is to blame:
https://www.dropbox.com/s/r9idu2h47v...bled.epub?dl=0
Armed with all this information, I can at least make a more informed decision about which reader to use with with books. Thanks again to you all for the information you have shared.