Allow uploading not registered files
define('ALLOW_UNFILTERED_UPLOADS', true);Disable All Updates
define( 'AUTOMATIC_UPDATER_DISABLED', true );
To enable automatic updates
define( 'WP_AUTO_UPDATE_CORE', true );
WP_SITEURL
define( 'WP_SITEURL', 'http://example.com/wordpress' );
WP_HOME
define( 'WP_HOME', 'http://example.com/wordpress' );
Disable the cron entirely by setting DISABLE_WP_CRON to true.
define( 'DISABLE_WP_CRON', true );
Make sure a cron process cannot run more than once every WP_CRON_LOCK_TIMEOUT seconds.
define( 'WP_CRON_LOCK_TIMEOUT', 60 );
Empty Trash
define( 'EMPTY_TRASH_DAYS', 30 ); // 30 days define( 'EMPTY_TRASH_DAYS', 0 ); // Zero days
Automatic Database Optimizing
define( 'WP_ALLOW_REPAIR', true );
Require SSL for Admin and Logins
define( 'FORCE_SSL_ADMIN', true );
Cleanup Image Edits
define( 'IMAGE_EDIT_OVERWRITE', true );
Disable unfiltered HTML for all users
define( 'DISALLOW_UNFILTERED_HTML', true );
Increase PHP Memory
define( 'WP_MEMORY_LIMIT', '64M' );
Set MAX memory limit
define( 'WP_MAX_MEMORY_LIMIT', '256M' );
Source: https://codex.wordpress.org/Editing_wp-config.php#Disable_Cron_and_Cron_Timeout
Source: https://codex.wordpress.org/Configuring_Automatic_Background_Updates