Wordpress: Disable heartbeat

If wordpress is taking too much server resources, you can disable wordpress heartbeat. If you are using buddypress, disable "Activity auto-refresh" in Buddypress settings.

http://www.inmotionhosting.com/support/website/wordpress/heartbeat-heavy-admin-ajax-php-usage

In the above page, you will find the code to disable heartbeat on all pages except post.php and post-new.php (here it is required for autosave while creating new posts and commenting).

To be added in functions.php

add_action( 'init', 'stop_heartbeat', 1 );

function stop_heartbeat() {
        global $pagenow;

        if ( $pagenow != 'post.php' && $pagenow != 'post-new.php' )
        wp_deregister_script('heartbeat');
}