The app is slow / Actions are slow on the Bookshelf and List screen
Recreating the book list may solve your issue.
Please try the following procedure if there is a problem with the app operation, such as taking 2-3 minutes to make one action.
- Recreate book list from settings :[Settings] – [Recreate Book List]
- Delete downloaded eBook files
- Uninstall, then reinstall the app