Performant Translations


This project uses a new approach to handle translation files in WordPress, making localization blazing fast.

An in-depth i18n performance analysis showed that localized WordPress sites load significantly slower than a site without translations.

With this plugin’s new approach to localization, this overhead is massively reduced, making your site fast again.

If your site is using a language other than English (US), you should see immediate speed improvements simply by activating this plugin.

The primary purpose of this plugin is to allow broader testing of these enhancements, for which the goal is to eventually land in WordPress core.

Performant Translations supports multiple file formats (.mo, .php, and .json), as well as multiple text domains and locales loaded at the same time. By default, it converts existing .mo files to .php and afterwards only loads the translations from the .php file.


  • Chart showing the load time improvement achieved with this plugin.


Installation from within WordPress

  1. Visit Plugins > Add New.
  2. Search for Performant Translations.
  3. Install and activate the Performant Translations plugin.

Manual installation

  1. Upload the entire performant-translations folder to the /wp-content/plugins/ directory.
  2. Visit Plugins.
  3. Activate the Performant Translations plugin.


What makes this plugin so fast?

By converting .mo files to .php files, the translations can be parsed much faster.
Plus, .php files can be stored in the so-called OPcache, which provides an additional speed boost.

Can I use this plugin on my production site?

While the plugin is mostly considered to be a beta testing plugin, it has been tested and established to a degree where it should be okay to use in production.
Still, as with every plugin, you are doing so at your own risk.

Has this plugin been tested with other multilingual plugins?

Yes. This plugin has been tested with common multilingual plugins, such as WPML, Weglot, TranslatePress, MultilingualPress, and Polylang.
If you still encounter issues, please let us know.

Do I need to do anything special to enable this plugin?

No. Once the plugin is activated, it just works, and you should see speed improvements right away. If you run into issues, please open a new support topic.

Can I safely remove this plugin after installation?

Yes. Once you deactivate and uninstall the plugin, all .php files generated by it will be removed from the server.

How can I contribute to the plugin?

Contributions are always welcome! Learn more about how to get involved in the Core Performance Team Handbook.

Where can I submit my plugin feedback?

If you have suggestions or requests for new features, you can submit them as an issue on the GitHub repository.

If you need help with troubleshooting or have a question about the plugin, please create a new topic on our support forum.

Where can I report security issues?

To report a security issue, please visit the WordPress HackerOne program.


2023년 9월 27일
I can see the change of the site speed. I can't wait for you to integrate it into the core.
2023년 9월 10일
Use it on a client site and we maintained under 1 second load times, which is on par with our other sites. Deserves 5 stars hands down.
모든 10 평가 읽기

기여자 & 개발자

“Performant Translations”(은)는 오픈 소스 소프트웨어입니다. 다음의 사람들이 이 플러그인에 기여하였습니다.


“Performant Translations”(이)가 14(으)로 번역되었습니다. 기여해 주셔서 번역자님께 감사드립니다.

자국어로 “Performant Translations”(을)를 번역하세요.

개발에 관심이 있으십니까?

코드 탐색하기는, SVN 저장소를 확인하시거나, 개발 기록RSS로 구독하세요.


For the plugin’s full changelog, please see the Releases page on GitHub.


  • Enhancement: Improved compatibility with Loco Translate to avoid duplicate files.


  • Enhancement: Several minor performance improvements.
  • Enhancement: Use different file extension (.mo.php instead of just .php) to prevent conflicts.
  • Enhancement: “Import” existing translation file if one is already loaded for a text domain.
  • Enhancement: Use WP Filesystem API if available.


  • Enhancement: Improved compatibility with Query Monitor’s developer tools panel.
  • Enhancement: Added new performant_translations_load_translation_file filter.
  • Enhancement: Enforce network-only activation on Multisite.


  • Fixed: Add hardening for invalid values being passed to translation functions.


  • Enhancement: Regenerate translation files when Loco Translate updates MO files.
  • Fixed: Add hardening for invalid context being passed.
  • Fixed: Fix handling of locales without plurals, such as Persian.


  • Initial release.