I stated earlier that the page turning seemed slower in this new version compared to the archaic 3.19 firmware I've been using.
Well, I decided to give it another chance and side-loaded 4.6.9995 again, and again, I felt it was slower at page turns. So I went back to 3.19, made a video of page turns, re-side-loaded 4.6 and made a video of page turns using it.
I watched the videos side by side several times, and the speed looks identical.
I've come to the conclusion it must be psychological.