WordPress at a glance
function is not described

wp_metadata_lazyloader() WP 4.5.0

Retrieves the queue for lazy-loading metadata.

No Hooks.

Return

WP_Metadata_Lazyloader. $lazyloader Metadata lazyloader queue.

Usage

wp_metadata_lazyloader();

Code of wp metadata lazyloader: wp-includes/meta.php VER 5.0.3

<?php
function wp_metadata_lazyloader() {
	static $wp_metadata_lazyloader;

	if ( null === $wp_metadata_lazyloader ) {
		$wp_metadata_lazyloader = new WP_Metadata_Lazyloader();
	}

	return $wp_metadata_lazyloader;
}