Feature Description

Ref: https://core.trac.wordpress.org/ticket/17268

The issue now is that for every file mo is read by PHP with a binary parser for every single page request and there isn't any object cache or using the native PHP module that exists since php 5.3 (I am not sure but it was already avalaible in 2017 when I did my patch).

More then half of the wordpress websites are not in english -> https://wordpress.org/about/stats/ it is something that can have an effect in a lot of things including rest endpoints (for gutenberg in 5.0 it was implemented a code that doesn't load a mo file if is not needed in the page to improve the performance).

5 years ago (before php 7) I did some comparison with a patch on wp 4.9 -> https://imgur.com/a/4k9oi (you find everything in the ticket) 500 vs 800 ms with some booster with object cache