Accelerator for K2
The Accelerator for K2 system plugin for Joomla makes use of Michal Migurski's PHP JSON encoder/decoder, Services_JSON, to dramatically improve K2 performance on pages which handle large amounts of JSON data. The larger the amount of data, the greater the gain.
Services_JSON requires at least PHP 4.3 to work properly, meaning its minimal requirements match those of Joomla 2.5.
The Accelerator for K2 system plugin will work with either Joomla 2.5 or 3.x, and any version of K2. All you need to do is enable the plugin. There are no additional settings.