different event behaviour comparison

exp.js

'use strict';
/* eslint-disable no-console */

var TEST_DELAY = 0;
var TEST_SIZE = 1000;
console.log('TO-Starting ' + TEST_SIZE);
var tos = Array.apply(null, Array(TEST_SIZE)).map(function startTimeout() {
  return setTimeout(function stopAllTimeouts() {
    try {
      console.log('TO-Stopping ' + tos.length);
      tos.forEach(function stopTimeout(to) {
        clearTimeout(to);
      });
    }
    catch (e) {
      console.error(e);
    }
  }, TEST_DELAY);
});
console.log('TO-Started ' + TEST_SIZE);
setTimeout(function printBye() {
  console.log('TO-After ' + TEST_SIZE);
}, TEST_SIZE);

if (typeof document === 'object') {
  var elem = document;
  var event = document.createEvent('Event');
  event.initEvent('build', true, true);
  console.log('DOM-Starting ' + TEST_SIZE);
  var handlers = Array.apply(null, Array(TEST_SIZE)).map(function createHandler() {
    var callback = function destroyAllHandlers(e) {  // eslint-disable-line no-unused-vars
      console.log('DOM-Stopping ' + handlers.length);
      handlers.forEach(function destroyHandlers(handler) {
        elem.removeEventListener('build', handler);
      });
    };
    elem.addEventListener('build', callback);
    return callback;
  });
  console.log('DOM-Started ' + TEST_SIZE);
  elem.dispatchEvent(event);
  console.log('DOM-After ' + TEST_SIZE);
}

var EventEmitter;
try {
  EventEmitter = require('events');
} finally {}
if (typeof EventEmitter === 'function') {
  var myEmitter = new EventEmitter();  // eslint-disable-line no-undef
  myEmitter.setMaxListeners(TEST_SIZE);
  console.log('EE-Starting ' + TEST_SIZE);
  var listeners = Array.apply(null, Array(TEST_SIZE)).map(function createListener() {
    var callback = function destroyAllListeners(e) {  // eslint-disable-line no-unused-vars
      console.log(' EE-Stopping ' + listeners.length);
      listeners.forEach(function destroyListener(listener) {
        myEmitter.removeListener('event', listener);
      });
    };
    myEmitter.addListener('event', callback);
    return callback;
  });
  console.log('EE-Started ' + TEST_SIZE);
  myEmitter.emit('event');
  console.log('EE-After ' + TEST_SIZE);
}