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Found the problem. It was in Calibre. There is a setting for EPUB output that has to do with file splitting. The default is 260k. This has to do with the xml formatting, or something. Somehow, I had added a zero and made the setting 2060. So the file was so big, it just started slowing down as I read further. I set it back to 260, reconverted, and page turning is back to almost bearable speed.
Michael
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