When scrolling the feed with compact mode on, thumbnails are loaded while posts are shown.
Some sort of lazy loading would be awesome here. So thumbnails would get preloaded before you actually scroll down, thus you’d never see the actual loading happen.
Would look and feel much smoother.
Lazy loading is definitely used for exactly this. I’ve done similar stuff in react native. You load “just what you need” which is a couple of thumbnails more than can be seen.