Kevin,
Nice work--thanks for sharing.
As noted, I had 46 chapters that I created in an early version of ID, 3 that were exceptionally slow when I converted to ID-CC, 1 of which was non-responsive. Per your suggestion above, I took a look at the hyperlinks. Bingo! The problem with each of the 3 chapters is that in the translation, some/many/all of the external URL hyperlinks were converted to Shared Destination. When I was working with the 1 of the hyperlinks on that 1 chapter in question, it actually linked to the down-version of the original file. So effectively, the poor response time was a function of CC "calling" a completely different chapter. Since I have about 50 URLs that were converted to Shared Destination in a different ID file, I can see where there would be performance problems. I deleted all of the hyperlinks, recreated, and the performance problems were eliminated.
What is interesting to me is that I don't think I had any "translation/conversion" issues with at 43 out of the 46 chapters. I don't have the time right now to review all so I sampled, and all seemed fine. When I reviewed 1 of the 3 problematic chapters, I saw were some of the links had copied over correctly, some hadn't.
I am in the final steps of validating my entire book, so I may have more to share with the community, and with Javed down the road.
Thanks again, re-keying is a pain, but not nearly as tedious as being stuck, Bill