---
title: Object Caching with Memcache
url: "https://pressable.com/knowledgebase/object-caching-memcached/"
published: 2019-05-08
modified: 2026-02-12
author: Wayne McWilliams
---

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. However, Pressable uses **Memcache** to store cached data in the object cache **persistently** across page loads to speed up your site.

You can clear this cache by using the **[Flush Object Cache](https://pressable.com/knowledgebase/how-to-purge-cache-in-wordpress-cdn/)** button in the **Cache** tab for your site in the MyPressable Control Panel. If your site is experiencing a lot of traffic, this can temporarily reduce site speed as the entire cache is purged. This will return to normal once the cache has regenerated.

![](https://i0.wp.com/pressable.com/wp-content/uploads/2019/05/object-cache.png?resize=1024%2C840&ssl=1)

You can also use the [Pressable Cache Management plugin](https://pressable.com/knowledgebase/pressable-cache-management-plugin/) to manage this from your site’s WP Admin dashboard.

If you need to regularly modify specific data in the object cache, it is advisable to use the built-in WordPress functions for this:

- [WP Cache Delete](https://developer.wordpress.org/reference/functions/wp_cache_delete/)
- [WP Cache Replace](https://developer.wordpress.org/reference/functions/wp_cache_replace/)
- [WP Cache Flush](https://developer.wordpress.org/reference/functions/wp_cache_flush/)

Determining which function to use comes down to what you are trying to achieve.