Memcached 是一种高性能的分布式内存对象缓存系统。在动态应用，Memcached 既能提高访问的速度，同时还减低了数据库的负载。

如果空间支持memcached，可以安装插件让wordpress支持memcached（当然vps或独立主机可以自己安装memcached）。

首先后台直接搜索memcached，找到 Memcached Object Cache 这个插件，安装。然后看插件的readme.txt：

Contributors: ryan, sivel
Tags: cache, memcached
Requires at least: 3.0
Tested up to: 3.5
Stable tag: 2.0.2

Use memcached and the PECL memcache extension to provide a backing store for the WordPress object cache.

== Description ==
Memcached Object Cache provides a persistent backend for the WordPress object cache. A memcached server and the PECL memcache extension are required.

== Installation ==
1. Install [memcached](http://danga.com/memcached) on at least one server. Note the connection info. The default is `127.0.0.1:11211`.

1. Install the [PECL memcache extension](http://pecl.php.net/package/memcache)

1. Copy object-cache.php to wp-content

这个插件和普通插件有点不一样，Drop-in高级插件，需要将插件文件放在wp-content目录下。安装完成之后，后台显示为：