https://redditblog.com/2017/1/17/caching-at-reddit/
Basically they had a 10 request component. Only one on the page so even though it wasn't that efficient, they didn't care.
But then their PM wanted 20 of them on a page. It was a Scrum team so velocity mattered, so they just had a for loop generate 20 of them.
https://redditblog.com/2017/1/17/caching-at-reddit/