My Kobo is super slow too. I only have 3 books on it. I've reset it and even re-installed the firmware to no avail. My battery drains itself within a week and it's off all the time. Every time I pick it up to read a book to the kids I have to re-charge it first. I don't think there's anything you're going to be able to do to make it faster and I'm sure you're past your warranty? Try calling CS like Terminator suggests but I don't think they'll be much help.
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