Here is what I was able to determine. The slowdown occurs only on one epub that is heavily bookmarked. I redownloaded the epub from my kobo account, and the fresh copy page turns are just fine. So, it looks like something happened to it on the device. I'll move it over to another reader to see if the slow pageturns persists for the corrupt copy.
The culprit I suspect is bookmarking. My reasoning - I noticed other problems with bookmarking. Most important (and I replicated this in other epubs) once you bookmark a page, the bookmarked page and the page before it require 2 flipbar flips to turn the page (i.e. page forward, nothing happens, page forward again and the page turns). This behavior persists even after removing the bookmark.
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