preload images?

[techieshark]

In a couple cases, image preloading could make app seem faster:

• while discovering, once we've loaded one image, we could load the first image for the next story the user might see
• when viewing a story, while viewing the intro page we could preload the second image for that story.
• when viewing the nth image for a story, we could be preloading image n+1 (e.g. preload 3rd image while user is viewing 2nd image).

see also:

• http://www.photo-mark.com/notes/image-preloading/
• https://www.smashingmagazine.com/2016/02/preload-what-is-it-good-for/