Phil Kills off Admin Ajax via a Plugin

toggle-admin-ajax.php

<?php
/**
 * Plugin Name: Phil Kills of Admin Ajax via a Plugin
 * Plugin URI: https://yourmom.com
 * Description: A Drop In Plugin That'll kill off admin-ajax.php. No options, just ACTIVE or INCACTIVE :-) 
 * Version: 1
 * Author: Brad
 * Author URI: https://yourmom.com
 * Requires at least: 4.5
 * Tested up to: 4.5
**/

/* Phil Kills of Admin Ajax via a Plugin */
/* Simply drop this file into your plugins folder via FTP or add the code to your child themes functions.php */
/* It's gonna completely kill off any and all admin-ajax.php options */
/* Autosave & Locking Live Edits to Only ONE person will be disabled */
/* If you know you ain't ever gonna need those two options, leave 'em DISABLED & leave this plugin ACTIVE */

add_action( 'init', 'stop_the_dang_heartbeat_permanently', 1 );
function stop_the_dang_heartbeat_permanently() {
wp_deregister_script('heartbeat');
}