How do I use WP-Optimize caching?

by Wayne Mullins | Jul 19, 2019

For a detailed walk-through on how to use the WP-Optimize caching feature, we put together a video that takes you through all the necessary steps:

How to resolve an error in advanced-cache.php

by Marc Lacroix | Dec 19, 2019

If you activate 2 caching plugins (or at least the functionality) at the same time, this might cause a fatal error and break your site.

Follow these instructions to recover your site:

• Connect to your server via FTP (or an other way if you prefer).
• Browse to the root of the WordPress installation, where you should have a file named wp-config.php.
• Download this file and open it in a text editor, such as notepad (Windows) or textedit (Mac).
• Locate the line define('WP_CACHE', true);, delete it, save the file and upload it back via FTP.
• Then still via FTP, enter the folder wp-content and delete the file advanced-cache.php
• You should now be able to reconnect to your administration.
• Go to one or all of your caching plugins settings, and only keep 1 activated.

If the error comes back before you had a chance to do this:

• Try the first part again, and before going to the admin, do the following:
• Using FTP, browse to the folder wp-content/plugins, and rename the folders of all caching plugins (for example by adding a -).
• Then go to Plugins in your administration, and make sure the cache plugins are deactivated.
• Using FTP, browse to the folder wp-content/plugins, and rename the folders of all caching plugins back to their original names.
• You can now reactivate the caching plugin of your choice.

When does WP-Optimize clear the page cache?

by Wayne Mullins | Jul 19, 2019

Full cache purge:

• When changing/updating current themes and parent themes (of child themes)
• When changing/updating current plugins
• When turning off the cache feature in WP-Optimize
• When editing widgets
• When saving the customizer settings
• When updating a menu
• When Autoptimize purges its cache
• When updating permalink structure
• When changing cache settings
• When updating string translations in WPML plugin
• When updating the ‘posts_per_page’ option
• When purging Avada theme’s fusion caches
• When saving any of GetWooPlugins’ settings (Premium)

This can be changed by hooking into the filter wpo_purge_cache_hooks. E.g.

// Add a new action that will trigger a cache purge
add_filter( 'wpo_purge_cache_hooks', function( $actions ) {
    $actions[] = 'my_custom_action';
    return $actions;
} );

Partial cache purge:

• When you publish new content or update/edit existing content, the cache for that post/page will be cleared, as well as associated content (category archives, blog archives)
• When comments are approved, or their status changes
• When terms are created or updated
• When changing/updating stock quantity of WooCommerce product or product variation
• When updating the ‘page_on_front’ option
• When updating ‘page_for_posts’ option
• When updating the ‘URLs to exclude from caching’ WP-Optimize caching configuration
• When trashing a post
• When running importers
• When WooCommerce product is on sale (Premium)

Which web servers is WP-Optimize compatible with?

by Wayne Mullins | Jul 19, 2019

WP-Optimize is compatible with all web servers, including:

• Apache
• NGINX
• Microsoft IIS
• Litespeed
• Lighttpd

However, only Apache makes it possible for a WordPress plugin to turn on Gzip compression and static caching headers; thus, on other webservers, WP-Optimize can only test and advise whether these beneficial features are active, but cannot itself turn them on.