I mean, a lot of those website probably use WPML which is, as we call it in french, “une usine à gaz”… Performance is terrible on every site that use it. That’s why I ditched it in favor of other solutions (Polylang currently) and run smoothly on more than 30 websites.

More ways to integrate translation would be welcome though… and maybe one day an official multilingual (or native even?!) solution for WordPress will be reality. I’ve always been surprised by the lack of fully functional and recommended free (libre) multilingual solution for WP…