Speed Up 8211 Translation Cache is a free WordPress plugin designed to enhance the performance of localized WordPress sites by caching translation files. By addressing the inherent delays caused by unpacking these files, the plugin can reduce loading times significantly, potentially improving page performance by up to three times. It operates seamlessly without requiring any configurations, making it user-friendly for all WordPress administrators.

The plugin is lightweight, at only 5 kB, and supports multiple languages as well as the caching of translation files for plugins. It is compatible with WordPress Network/Multisite installations and automatically clears the cache when any translation file is updated. For optimal performance, it's recommended to ensure that the persistent cache is installed in the /wp-content/ directory.