ember-instrumentation.js

beginInstrumentation = function(eventName) {
  var styles;
  if (eventName == null) {
    eventName = "render";
  }

  styles = {
    "render.render.metamorph": "color: #a47701;",
    "render.render.boundHandlebars": "color: #0f51fe;",
    "render.view": "color: #37be02;"
  };

  Ember.subscribe(eventName, {
    before: function(name, ts, payload) {
      console.group(name);
      return ts;
    },
    after: function(name, ts, payload, b_ts) {
      var elapsed, style;
      style = styles[name] || "";
      elapsed = (ts - b_ts).toFixed(4);
      console.log("%c" + payload.object + ": " + elapsed + "ms", style);
      return console.groupEnd();
    }
  });
};

beginInstrumentation();