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I don't think 869kb is unusual for a 500 page epub, the file size depends more on the size of the cover image and whether the book has emedded fonts. I just bought an omnibus of 3 books which has about 800 pages total and is about 900kb.
One thing you could check is whether the book has been split up into seperate files for each chapter. Some books have the whole book in one html file, and this can cause problems for the reader. To check this just use an unzip program to look inside the epub (you might need to rename the file from *.epub to *.zip to do this).
If you do find that the .html files are very large, say more than a few hundred kb, then you might be able to fix the book by using Calibre to do an epub-->epub conversion, which will split the book into one file per chapter. (You would need to remove any DRM from the book to do this).
The 900kb omnibus book I bought had one book per html file, each over 1MB, and it caused my Glo to run very slowly while reading it. Once I split the files with Calibre the problem disappeared. Your book might have a different problem, but this one is fairly easy to check and fix.
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