Quote:
Originally Posted by Seabound
Update! I finally re-generated my Don Quixote epub from the original prc using the latest calibre version 0.7.0. It now takes only ~6 minutes to load (1477 pages). I'll take it! 
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If you want to try a little experiment, you might find the results interesting.
Try:
1. Un-Zipping the .epub into a folder.
2. Find any graphic image files. The book covers and any maps or charts,
as well as any other embedded images.
3. Use a graphic editor, like the free GIMP2, to convert the images into
grayscale black and white images and scale them to fit the display dimensions
of the JBL, at the resolution of the JBL's display.
4. Replace the original image files in the un-zipped folder, with the ones you
have made.
5. Re-Zip the folder into a .zip file.
6. Load the new .zip file into Calibre and convert it into a new .epub ebook.
( Remember to use the "Jetbook 5-inch" output profile.)
Now see how fast it loads.
Luck;
Ken