Mark Jaquith

APC Object Cache provides a persistent memory-based backend for the WordPress object cache. APC must be available on your PHP install.
An object cache is a place for WordPress and WordPress extensions to store the results of complex operations. On subsequent loads, 
this data can be fetched from the cache, which will be must faster than dynamically generating it on every page load.
The APC Object Cache backend is also compatible with <a href="https://wordpress.org/extend/plugins/batcache/" rel="ugc">Batcache</a>, the powerful full page caching engine that runs on WordPress.com
Be sure to read the installation instructions, as this is not a traditional plugin, and needs to be installed in a specific location.

APC Object Cache Backend

APC Object Cache provides a persistent memory-based backend for the WordPress object cache. APC must be available on your PHP install.

petermolnar

WARNING The development of WP-FFPC had been put on hold. 
If you need new features, please send code and pull requests to <a href="https://github.com/petermolnar/wp-ffpc" rel="nofollow ugc">WP FFPC @ Github</a>.
A short why: I developed this plugin in 2010 to support my own site. Right now, as it is, it’s working on a few sites I still maintain for friends and since I don’t need any additional features, I’m not planning to extend it with things I have no real use of. During the past years I’ve received some heartwarming donations – unfortunately the amount never came close to consider the project financially beneficial. I removed the donation links and put it on hold for now.
WP-FFPC is a cache plugin for <a href="https://wordpress.org/" title="WordPress" rel="ugc">WordPress</a>. 
It works with any webserver, including, but not limited to, apache2, lighttpd, nginx.
It can be configured together with <a href="http://NGiNX.org" title="NGiNX" rel="nofollow ugc">NGiNX</a> but use <a href="http://nginx.org/en/docs/http/ngx_http_memcached_module.html" title="memcached plugin" rel="nofollow ugc">memcached plugin</a> directly from the webserver, bypassing PHP.
<h4>Requirements</h4>
This plugin does not kick in right after activation. You have to adjust the setting in Settings -> WP-FFPC and save the settings.*
<ul>
<li>WordPress >= 3.0</li>
<li>at least one of the following for storage backend:
<ul>
<li>memcached with <a href="http://php.net/manual/en/book.memcached.php" title="Memcached" rel="nofollow ugc">PHP Memcached</a> > 0.1.0</li>
<li>memcached with <a href="http://php.net/manual/en/book.memcache.php" title="Memcache" rel="nofollow ugc">PHP Memcache</a> > 2.1.0</li>
<li><a href="http://php.net/manual/en/book.apc.php" title="APC" rel="nofollow ugc">APC</a></li>
<li><a href="http://pecl.php.net/package/APCu" title="APC User Cache" rel="nofollow ugc">APCu</a></li>
</ul>
</li>
<li>PHP 5.3+ is really highly recommended, see “Known issues”</li>
</ul>
<h4>Known issues</h4>
<ul>
<li>errors will not be displayed on the admin section if PHP < 5.3, only in the logs. This is due to the limitations of displaying the errors ( admin_notices is a hook, not a filter ) and due to the lack of proper anonymus functions in older PHP.</li>
<li>If you’re using PHP 5.4+ avoid the APC backend: the plugin with that setup can even make your site slower. Please use APCu or memcached in this case.</li>
</ul>
<h4>Features:</h4>
<ul>
<li>various backends
<ul>
<li>memcached with <a href="http://php.net/manual/en/book.memcached.php" title="Memcached" rel="nofollow ugc">PHP Memcached</a></li>
<li>memcached with <a href="http://php.net/manual/en/book.memcache.php" title="Memcache" rel="nofollow ugc">PHP Memcache</a></li>
<li><a href="http://php.net/manual/en/book.apc.php" title="APC" rel="nofollow ugc">APC</a></li>
<li><a href="http://pecl.php.net/package/APCu" title="APC User Cache" rel="nofollow ugc">APCu</a></li>
</ul>
</li>
<li>cache exclude options ( home, feeds, archives, pages, singles; regex based url exclusion )</li>
<li>minor Woocommerce support</li>
<li>(optional) cache for logged-in users</li>
<li>404 caching</li>
<li>canonical redirects caching</li>
<li>Last Modified HTTP header support (for 304 responses)</li>
<li>shortlink HTTP header preservation</li>
<li>pingback HTTP header preservation</li>
<li>talkative log for <a href="https://codex.wordpress.org/WP_DEBUG" title="WP_DEBUG" rel="nofollow ugc">WP_DEBUG</a></li>
<li>multiple memcached upstream support</li>
<li>precache ( manually or by timed by wp-cron )</li>
<li>varying expiration time for posts, taxonomies and home</li>
<li>(warning: untested since WordPress 3.8) WordPress Network support
<ul>
<li>fully supported domain/subdomain based WordPress Networks on per site setup as well</li>
<li>will work in Network Enabled mode only for subdirectory based Multisites ( per site settings will not work in this case )</li>
</ul>
</li>
</ul>
Many thanks for donations, contributors, supporters, testers & bug reporters:
Harold Kyle, Eric Gilette, doconeill, Mark Costlow, Jason Miller, Dave Clark, Miguel Clara, Anton Pelešev, Firas Dib, CotswoldPhoto, tamagokun, Many Ayromlou, mailgarant.nl, Christian Rößner, Ameir Abdeldayem, Alvaro Gonzalez, Meint Post, Knut Sparhell, Christian Kernbeis, Gausden Barry, Maksim Bukreyeu, Lissome Hong Kong Limited, Gabriele Lauricella, 7th Veil, LLC, Julia Harsch, Grant Berntsen, Jorgen Ilstad, Cinema Minima for Movie Makers Worldwide

WP-FFPC

One of the best plugins for caching, simple and fast performance.

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A fast, memory based full page cache plugin supporting APC or memcached.

APC Object Cache Backend vs WP-FFPC