This should be placed in your wp-config.php (and no where else):
define( 'AUTOSAVE_INTERVAL', 60*60*60*24*365 ); // Set autosave interval to 1x per year
define( 'EMPTY_TRASH_DAYS', 0 ); // Empty trash now: Zero days
define( 'WP_POST_REVISIONS', false ); // Do not save andy revisions
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