Google Slides performance crumbles when you add too many gifs This happens primarily with a deck that has motion examples rendered as gifs
This bookmarklet to toggle the visibility of images in the filmstrip on and off
Copy the code from the hide.js file Create a new bookmark in your bookmarks bar Change the name to hide (optiona) Paste the code from hide.js
If you haven't made a bookmarklet before it's pretty easy to search on youtube and find an example. Here's a sweet video explaining it https://www.youtube.com/watch?v=4FMZmg3zh4s