MemcacheD Is Your Friend
Memcached Object Cache provides a persistent backend for the WordPress object cache. A memcached server and either the the PECL Memcached or PECL Memcache extension and class are required. Detects either the PECL Memecache or PECL Memcached (Memcached preferred) class and uses the appropriate interface. That means you don’t need to figure out which PHP class is available in your installation, the plugin will detect the proper configuration.
This plugin does not require manual copying of files between directories for installation, and it doesn’t require the installer to differentiate between the memcache and memcached PECL extensions if they know their host makes once available.
Also, because this plugin autodetects the PECL extension available, for those that develop on Windows where the PECL Memcached extension is not generally available, you can maintain a common configuration with your Linux host where that extension is common.
Plugin creates a dashboard menu option under “Tools” where you can view your memcached statistics.
Plugin is based laregly on previous works by Matt Martz, Ryan Boren (https://wordpress.org/plugins/memcached/) and Scott Taylor, Ryan Boren, Matt Martz, Mike Schroder ( https://wordpress.org/plugins/memcached-redux/ )