Optional on demand queue processing

Version 2.3 or greater

This setting has been deprecated and is no longer required to optimize anything related to the queue system. We've since moved our queue to use the Action Scheduler which is a highly optimized system to run queued jobs in Wordpress.

If you had the constant MAILCHIMP_DISABLE_QUEUE set to true, it's completely safe (and recommended) that you remove the define('MAILCHIMP_DISABLE_QUEUE', true); call, which is most likely to have been placed on your wp-config.php file.

Versions prior to 2.3

If you would like to turn off the background queue processing and handle jobs "on-demand" you can do so by adding a constant in your wp-config.php file: define('MAILCHIMP_DISABLE_QUEUE', true); This is helpful with high CPU usage on small servers by making a call to the admin-ajax file and manually processing a single request at a time.