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The way the KoboTouchExtended driver works is going to use a lot of resources if you are sending lots of books. And the bigger they are, especially the chapter count, the worse it will be. The driver is probably starting to many threads for these books. I plan to look at it, but, haven't had time yet. The 64bit version of calibre will push the limit up a lot, but, it probably still can be hit.
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