johanee

On every pageload a localized WordPress site spends a huge amount of time setting up the translation (l10n) object. Startup for a localized site can be almost four times slower than an untranslated one.
This plugin stores the translation object between pageloads so it only has to be created once, resulting in significantly better performance (performance graph included with screenshot).
Plugin supports caching multiple languages (if you use a multi-language plugin).
Available storage: Plain file, APC (Alternative PHP Cache), or SHMOP (Shared Memory)

Cache Translation Object

Substantially increase performance of localized WordPress by caching the translation (l10n) object. Supports multiple languages.

yushao

Translatio is an open source tool for internationalization and localization of WordPress based websites. Translatio provides two translation workflows:
<ul>
<li>Live Translation workflow</li>
<li>Full Professional Translation workflow</li>
</ul>
Live translation workflow provides instant translation based on Google Translate engine. Simply configure the extra languages you want to support through the intutuive setup interface and save, then you are done.
Full Professional workflow provides more control and higher translation quality, which involves extracting the text for translation, translating and integrating back into WordPress. More specifically Translatio plugin hosts your translations locally for proof reading, editing and final publication. You can intergrate machine translation of your choice to prepare your contents, then leveraging fully featured translation editor with any 3rd party translation agencies.
Translatio provides multiple ways to handle different development phases of the WordPress websites with intuitive and easy to use interfaces, some features include:
<ul>
<li>Live Translation powered by Google Translate</li>
<li>Support Taxonomies translation, including Categories, Tags</li>
<li>Support Woo Commerce </li>
<li>Full cycle to keep translation locally for proof read, edit and publish.</li>
<li>Support Search Engeine Optimizaion/SEO URL</li>
<li>Support new block Gutenberg editor and classic editor.</li>
<li>Support Google Translate integration with editing capability</li>
<li>Language switcher based on
<ul>
<li>Draggable floating meanu</li>
<li>Sidebar widget</li>
<li>Along with title or description</li>
<li>With any page or post</li>
</ul>
</li>
<li>Language switcher is in language name or flags</li>
<li>Detect browser language setting</li>
<li>Support browser cookie</li>
<li>Premium service available</li>
<li>Live support community</li>
</ul>

Translatio

Make your website multilingual ready at ease with live translation or with support of full translation cycle, with machine translation integration.

Cache Translation Object vs Translatio