The core performance team spent a lot of time this year looking into the performance of the i18n/l10n system in WordPress, after proving that loading translations had a significant hit on response time. This led to an in-depth performance analysis, followed by a dedicated Performant Translations feature plugin offering significant performance boosts for all WordPress sites with zero configuration. Thousands of sites successfully tested the plugin under a wide variety of conditions. Now, the team believes the solution is ready for inclusion in WordPress core.
