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I have a k4nt and I don't think 18 collections itself would be a problem. I have 12 collections and am using probably half the Kindle's memory capacity, and I haven't had any speed problems whatsoever. I think the "Collections" memory must be collections metadata (i.e. the names and a reference to the titles within them) and not the content of the books in them, so I wouldn't worry about it.
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