Sergey Biryukov

Converts gettext binary message catalogs to an array of strings. Allows to save some amount of RAM on a shared hosting server. 
Works with plugin and theme textdomains as well as with the default.
Thanks to AlexPTS for the idea.

Pure PHP Localization

Лучший и, скорее всего, единственный рабочий плагин. Спасибо, Сергей

Пожалуй, лучший плагин для кеширования переводов

Converts gettext binary message catalogs to an array of strings.

nikdow

Use this plugin to display detailed information about your server’s OPCache, including memory utilisation, list of all scripts cached and a useful memory utilisation visualisation based on the file system tree.
This plugin is based on https://github.com/rlerdorf/opcache-status which is for general PHP use, we have turned it into a WordPress plugin for ease of installation. Apart from some rearrangement of scripts to suit WP load conventions, the code is to date unaltered. WordPress capability ‘activate_plugins’ is required to see it in the admin menu and to run it.
After you install and activate this plugin, look in the admin Tools menu for OPCache.

OPCache Scripts

Use this plugin to display detailed information about your server’s OPCache, including memory utilisation, and a list of all scripts cached.

Pure PHP Localization vs OPCache Scripts