Remove expensive events from Ember's default set

event_cleaner.js

// Trim events down to a small subset of the default
Ember.EventDispatcher.reopen({
  events: {
    click       : 'click',
    keypress    : 'keyPress',
    mousedown   : 'mouseDown',
    mouseup     : 'mouseUp',
    mousewheel  : 'mouseWheel'
  }
});