I believe some people posted that replacing the default fonts (not the epub fonts, but the LRF/menu fonts) via flashing resulted in this behavior. I know that my 505 acted like that after a while but it has become quicker. I am not sure of why. I no longer replace the system fonts, only the fonts for epub using the PRS+ method.
If you haven't done that.. well, if you are willing to go to the trouble, you could try factory resetting your device and reloading your books and see if it helps. That's just based on my experience with Windows machines.. a format once a year or so helps so much. But it may be completely unhelpful in this instance.
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