Test using Ti.App events vs using JS only event system.

gistfile1.js

var win = Ti.UI.createWindow({backgroundColor: '#fff'})
  , Emitter = require('emitter') //https://github.com/component/emitter
  , event = new Emitter()
  , limit = 10000
  , i = 0
  , startTime
  ;

var buttonTi = Ti.UI.createButton({title: 'start-Ti', left: 10});
var buttonJs = Ti.UI.createButton({title: 'start-js', right: 10});

win.add(buttonTi);
win.add(buttonJs);
win.open();

var start = function(){
  console.log('->Starting');
  i = 0;
  startTime = new Date(); 
};

var stop = function() {
  var now = new Date();
  console.log(now - startTime, 'ms');
};


var eventData = {data: "to pass", to: "listener" };

buttonTi.addEventListener('click', function() {
  start();
  Ti.App.fireEvent('app:custom', eventData);  
});

buttonJs.addEventListener('click', function() {
  start();
  event.emit('app:custom', eventData );
});

Ti.App.addEventListener('app:custom', function(e) {
  i++;
  if(i < limit) {
    Ti.App.fireEvent('app:custom', eventData);
  }
  else {
    console.log('->Stopping Ti');
    stop();
  }
});

event.on('app:custom', function(e) {
  i++;
  if(i < limit) {
    event.emit('app:custom', eventData);
  }
  else {
    console.log('->Stopping Js');
    stop();
  }  
});