I dunno about the firmware upgrade (I've read that it actually makes it slower). But it definitely is slower and more noticeable when you add a book to it and it's still indexing it.
Why the screen refresh is linked to the CPU load is beyond me, but...when you just get a K3 and put a bunch of books on it's slower than it will end up being once it's finishing indexing them. Though it still always does it, it gets to be pretty quick.
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