Tiny cache

Cache post content, translations and nav menu output in persistent object cache.

This MU plugin works well in production providing you understand its source code (133 sloc).

WordPress performance

How to achieve high performance in WordPress?

This list concentrates on WordPress core generating HTML code. Frontend loading (full page cache) is another topic.

Usage

Of course you need persistent object cache. Consider Redis server and wp-redis plugin.

Replace the_content() calls in your theme.

NOTICE Replace only argument-less calls! $more_link_text and $strip_teaser are not supported.

find -type f -name "*.php" | xargs -r -L 1 sed -i -e 's|\bthe_content();|the_content_cached();|g'

No-cache situations

• wp_suspend_cache_addition( true );
• define( 'DONOTCACHEPAGE', true );

Prevent missing plugin

Protection against plugin deactivation.

Copy these to your theme's functions.php.

    if ( ! function_exists( 'the_content_cached' ) ) {
        function the_content_cached( $more_link_text = null, $strip_teaser = false ) {
            the_content( $more_link_text, $strip_teaser );
        }
    }
    if ( ! function_exists( 'get_the_content_cached' ) ) {
        function get_the_content_cached( $more_link_text = null, $strip_teaser = false ) {
            return get_the_content( $more_link_text, $strip_teaser );
        }
    }
    if ( ! function_exists( 'get_template_part_cached' ) ) {
        function get_template_part_cached( $slug, $name = null, $version_hash = '' ) {
            get_template_part( $slug, $name );
        }
    }

Little sisters

1. Tiny navigation menu cache - for nav menu output
2. Tiny translation cache - for translations (.mo files)

Alternative

https://github.com/Rarst/fragment-cache