Slideshow stutters on Layouts and Book Pages
Layouts and book page are assembled dynamically during the slideshow while it is running. If this takes too long then you may get some stumbling during the slideshow.
The time it takes to build these items depends on
Ways to improve this:
In this new version (coming in June/July 2019), we have added to option to "pre-buffer" layouts, book pages and rooms before the slideshow starts to avoid this issue. This new version also uses METAL hardware APIs on Macs running on the newer versions of OSX.
KnowledgeBase Article: Slideshow stutters on Layouts and Book Pages