wp_update_post call really slow when official Facebook plugin is installed

This is beacuse facebook plugins does some really intensive checks on every save_post and this slows down calls to wp_update_post and wp_save_post to a crawl ( about 2 seconds for each call ). If you want you can remove them

remove_action( 'save_post', 'fb_add_page_mention_box_save' );
remove_action( 'save_post', 'fb_add_friend_mention_box_save' );

The crazy thing is that facebook does a login for in both of these calls: 0.6 second each, they never cache anything!