The degradation is speculation on my part. I haven't ever experienced it. Yes, the 30 fps rate is for small updates. A full screen update (scrolling) is common

The degradation is speculation on my part. I haven't ever experienced it. Yes, the 30 fps rate is for small updates. A full screen update (scrolling) is commonly less than ~200 ms, and there are still ways to bring that number down. I agree, the Libra 2 is great :) Try koreader, it's noticeably faster than the stock reader application.