mu-plugin to defer term counting on all bulk edits

ClassSpeedUpBulkEdit.php

<?php if(!defined('ABSPATH')) { die(); } // Include in all php files, to prevent direct execution

if( !class_exists('SpeedUpBulkEdit') ) {
	class SpeedUpBulkEdit {
		private static $_this;
		private $is_bulk = false;

		public static function Instance() {
			static $instance = null;
			if ($instance === null) {
				$instance = new self();
			}
			return $instance;
		}

		private function __construct() {
			add_filter( 'wp_insert_post_empty_content', array( $this, 'turn_off_bulk_counts' ) );
			add_action( 'shutdown', array( $this, 'shutdown' ) );
		}

		public function turn_off_bulk_counts( $filter_data ) {
			if( isset( $_REQUEST['bulk_edit'] ) && $_REQUEST['bulk_edit'] ) {
				$this->is_bulk = true;
				wp_defer_term_counting( true );
			}
			return $filter_data;
		}
		public function shutdown() {
			if( $this->is_bulk ) {
				wp_defer_term_counting( false );
			}
		}
	}
	SpeedUpBulkEdit::Instance();
}