Epub page numbering: I do not use built-in (Adobe-style) page numbering.
Per screen page numbering: when you open a book for the first time, the reader renders the whole book in the background, calculating page breaks and stores the image in a cache, so you won't see the page numbers till it finishes. Only the animated dots.
The next time you open the same book the reader opens the previously rendered image from the cache, so page numbering is displayed instantly. But change the layout (like font size) and the reader has to re-render the book again.
Chapter progress display is calculated everytime you open the book, again displaying those animated dots.
After the update I simply could not turn on the device for 15 minutes, because I pressed the button too short or too long.
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