Images in apps and web pages are a bit like electricity, or the internet itself: You don’t notice them until they aren’t there. And when they aren’t there, the experience can be unpleasant.
When an image loads slowly or not at all, it’s easy to blame the network connection or the size of the image. However, there’s actually much more to it than that. An app’s ability to load images quickly depends in large part on the efficiency of its image processing routines, which use complex algorithms to load images as fast as possible without degrading image quality.