By default the WordPress object cache is non-persistent. This means that data stored in the object cache resides in memory only and only for the duration of the request.

CloudyShaper deploys Memcache for object caching and sites leverage WordPress’ persistent objecting caching by default. No additional plugins are required.

This implementation stores the results of database queries in memory, persistently across page loads. This helps speed up PHP execution times, reduces the load on the database, and delivers content to visitors faster.

Example

Let’s say a webpage has a query that looks up the post type “slideshow” and pulls out every single post that exists in the database for that post type.

'slideshow', 'showposts'=>-1, 'posts_per_page' => 1, 'paged' => $paged )); ?> 

Without object caching, this query would constantly access and pull information from the site’s database.

With object caching, the query becomes cached and results are queried from memory.