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ember-perf 1.11 - 1.13, 2.4-lts, 2.8-lts, 2.12.2, Release, Beta npm version Build Status

Page load performance instrumentation for ember.js apps


# Ember.js >= 1.11
ember install ember-perf

Responding to performance events

Transition Events

First, create an initializer, which will set up an event listener to monitor performance events

ember g ember-perf-initializer monitor-perf

This will create files for you called

  • app/initializers/monitor-perf.js
  • app/instance-initializers/monitor-perf.js

You then need to go to the instance intializer and fill in the body of the event listener with something useful (i.e., sending the performance data somewhere).

perfService.on('transitionComplete', transitionData => {

Render Events

To track render performance within a single route (i.e. how long did it take for an action triggered rerender to complete), you would use the measureRender method.

// app/components/x-foo.js
export default Ember.Component.extend({
  emberPerf: Ember.inject.service(),

  actions: {
    measureStuff() {
      const perf = this.get('emberPerf');

        .then(function(result) {
          // do things with the result

You can also use the renderComplete event on the service from app/instance-initializers/monitor-perf.js:

perfService.on('renderComplete', renderData => {
  // Do awesome things!

What does this transitionData object look like?

Here's an example

	"destURL": "/",
	"destRoute": "index",
	"startTime": 402.85299999959534,
	"endTime": 427.16400000063004,
	"routes": [{
		"name": "application",
		"debugContainerKey": "route:application",
		"startTime": 408.78300000076706,
		"views": [],
		"endTime": 413.8860000002751,
		"elapsedTime": 5.102999999508029
	}, {
		"name": "index",
		"debugContainerKey": "route:index",
		"startTime": 415.29199999968114,
		"views": [0, 1, 2], // references to viewData array (by index)
		"endTime": 418.11000000052445,
		"elapsedTime": 2.8180000008433126
	"viewData": [{
		"startTime": 431.6899999994348,
		"id": "ember341",
		"containerKey": "view:-outlet",
		"endTime": 464.19799999966926,
		"elapsedTime": 32.50800000023446
	}, {
		"startTime": 438.75200000002224,
		"id": "ember347",
		"containerKey": "view:toplevel",
		"parentViewId": "ember341",
		"endTime": 463.9900000001944,
		"elapsedTime": 25.23800000017218
	}, {
		"startTime": 450.5559999997786,
		"id": "ember365",
		"containerKey": "component:-link-to",
		"parentViewId": "ember347",
		"endTime": 463.54000000064843,
		"elapsedTime": 12.984000000869855
	"elapsedTime": 24.3110000010347


This addon can be configured in your config/environment.js file

if (environment === 'development') {
	// Log transition performance
	ENV.emberPerf = {
      debugMode: true
  • debugMode (default: false) - Logs transition performance to the browser console



*Ember 2.3 doesn't work with ember-perf.

Developer Installation

  • git clone this repository
  • npm install
  • bower install


Running the app using an ember-try scenario

  • ember try:one <EMBER_TRY_SCENARIO> --- ember serve ( for example ember try:one ember-2.4 --- ember serve)
  • Visit the app at http://localhost:4200.

Running Tests

All Supported Ember Versions

  • npm test

Individual Ember Versions

  • ember try:one <EMBER_TRY_SCENARIO> (for example, ember try:one ember-2.4)
  • ember try:one <EMBER_TRY_SCENARIO> --- ember test --server (for example, ember try:one ember-2.4 --- ember test --server)

Reset Dependencies

  • ember try:reset

This command restores the original bower.json from bower.json.ember-try, rm -rfs bower_components and runs bower install. For use if any of the other commands fail to clean up after (they run this by default on completion).


  • ember build

For more information on using ember-cli, visit