This article shows how a very simple automatic batching strategy can be applied on top of SFML without affecting the library API, resulting in free performance for the end user!

free performance: autobatching in my SFML fork

by Vittorio Romeo

From the article:

In one of my previous articles, I discussed the design and implementation of the batching system in my fork of SFML. Wouldn’t it be nice if drawables were automatically batched, whenever possible?