Documentation / Continuous Integration

Continuous Integration

You can use to keep track of what is happening with your site by making sure that you don’t break performance best practice rules before you push changes to production. You can leverage budgets to break your build if your page has too many assets, they are too big, or even too slow. You can even use WebPageTest metrics to break a build!

To do this you define your own budget file with rules on when to break your build. This budget will return an error code status after the run. You can also choose to output JUnit XML and TAP reports.

GitHub Actions #

If you are using GitHub Actions it’s super easy to run It works well with a performance budget. You should set your budget in a file in the repo that you are testing. In this example we call the file budget.json and put it in the .github folder in the repo.

Setup a simple budget that checks the URLs you test against number of requests, transfer size, third parties and different Coach scores (read the documentation on how to configure other metrics):

  "budget": {
    "requests": {
        "total": 100
    "transferSize": {
        "total": 400000
    "thirdParty": {
        "requests": 0
    "score": {
      "bestpractice": 100,
      "privacy": 100,
      "performance": 100

Then you can setup your workflow either via the GitHub GUI or commit it to your repo via the command line or an IDE of choice. The workflow YAML should reside in the .github/workflows folder of your repo and you name it as you like. An example simple setup using a performance budget looks something like this:

on: push
    runs-on: ubuntu-latest
    name: running
      - name: code checkout
        uses: actions/checkout@v2
      - name: running container with arguments and optional Docker options
        run: docker run -v "$(pwd):/" sitespeedio/ --budget.configPath .github/budget.json -n 1 

As arguments and Docker options you can use all configurations options as you usually do with Since we don’t use any timing metrics in the budget we only do one run.

If your budget fails, your workflow will fail.

When there’s a new release and you wanna use that you just bump the version number of your workflow.

Jenkins #

The most convenient way to run in Jenkins is to use the pre-built Docker containers. You can run an installed npm version too, but that method will require additional work as you will need to setup browsers and use the Xvfb plugin to make the browsers run in headless mode. Trust us use the Docker Images you will thank us later. ;-)

Setup #

  • Choose New Item and create a new freestyle project.
  • Choose Add build step in the Build section and Execute shell. With this you will have a box where you can add your CLI magic. Remember that the Jenkins user needs to be able to run Docker.
  • We then map the Jenkins workspace’s output folder in Docker to the Host, so that the HTML result is visible outside of the container.
docker run -v ${WORKSPACE}:/ sitespeedio/ --outputFolder output -n 1
  • You can then install the Publish HTML Reports plugin to make the reports easy available in Jenkins. You can add it as a Post-build Actions and set the HTML directory to archive to output/ (it is relative to the workspace). HTML reports

The HTML result pages runs JavaScript, so you need to change the Jenkins Content Security Policy for them to work with the plugin.

When you start Jenkins make sure to set the environment variable -Dhudson.model.DirectoryBrowserSupport.CSP="default-src 'self' 'unsafe-inline' 'unsafe-eval'; img-src 'self' 'unsafe-inline' data:;".

  • If you want to break your build, you should generate a JUnit XML and use the built-in post task Publish JUnit test result report. Make sure to make the budget file available inside the Docker container. In this example we have it inside the Jenkins workspace.
docker run -v ${WORKSPACE}:/ sitespeedio/ --outputFolder output --budget.configPath / --budget.output junit -n 1
  • Setup the JUnit report: JUnit reports

Remember that you can also send the metrics to Graphite to keep a closer eye on all metrics over time.

Travis #

We have an example project for setting up Travis You should not try to use timings in your budget, simply because they tend to vary and be highly unreliable. We suggest using metrics that do not vary greatly and will be the same between runs like Coach score or number of requests.

Circle CI #

Setting up your sitespeed tests on Circle is a straight forward process. What works the best is to use Circle’s Linux VM which will spin-up a pre-configured VM made to run variations of Docker and pre-installed with lots of tools that you may need to get sitespeed up and running.

  1. Hook up your git project with Circle to get a .circle folder and config.yml file
  2. Create a job and be sure to flag the machine variable to true
  3. Define your working directory
  4. Run Linux commands to set up the environment for testing
  5. Place the sitespeed docker commands in a - run: statement

Here is a simple example of a git project that will checkout git project and run a standard test with traffic shaping!

version: 2
    machine: true
    working_directory: ~/repo
      - checkout
      - run: sudo modprobe ifb numifbs=1

      # 3G
      - run: docker run --cap-add=NET_ADMIN --shm-size=1g --rm sitespeedio/ -c 3g --browsertime.connectivity.engine=throttle

      # No Traffic shaping
      - run: docker run --shm-size=1g --rm sitespeedio/

      # No traffic shaping with performance budget
      - run: docker run --shm-size=1g --rm -v "$(pwd):/" sitespeedio/ -n 3 --budget.configPath myBudget.json

  version: 2
      - test-sitespeed

You will notice that the last run is reading the performance budget file that exists in the git repo that was checked out. This will only work if you mount the checked out repo as a volume for sitespeed. This makes is really efficient and convenient to allow sitespeed to pick up configuration files and to output results to a location where one can post-process with other scripts.

Gitlab CI #

Gitlab has prepared an easy way to test using

Grunt plugin #

Checkout the grunt plugin.

Gulp plugin #

Checkout Ankit Singhals gulp plugin.