slideshow starts before page is loaded

[Alia17]

When testing the book on a remote server I noticed that starting the slideshow makes pages flip before they are loaded and shown.  It could be partially solved by setting longer time period in slideshow timer, but different users can have different internet connection speed, so it would seem to someone with quick internet that the pages are shown too slowly. To my mind it should work somewhat like this: check, if the page is loaded, and if done, start timer for a page.