2019-09-04 21:01:54 +05:30
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---
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type: reference, howto
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---
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2019-09-30 21:07:59 +05:30
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# Browser Performance Testing **(PREMIUM)**
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2019-07-31 22:56:46 +05:30
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> [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3507)
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in [GitLab Premium](https://about.gitlab.com/pricing/) 10.3.
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If your application offers a web interface and you are using
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[GitLab CI/CD](../../../ci/README.md), you can quickly determine the performance
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impact of pending code changes.
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2019-09-04 21:01:54 +05:30
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## Overview
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2019-07-31 22:56:46 +05:30
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GitLab uses [Sitespeed.io](https://www.sitespeed.io), a free and open source
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tool for measuring the performance of web sites, and has built a simple
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[Sitespeed plugin](https://gitlab.com/gitlab-org/gl-performance)
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which outputs the results in a file called `performance.json`. This plugin
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outputs the performance score for each page that is analyzed.
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2019-09-30 21:07:59 +05:30
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The [Sitespeed.io performance score](https://examples.sitespeed.io/6.0/2017-11-23-23-43-35/help.html)
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2019-07-31 22:56:46 +05:30
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is a composite value based on best practices, and we will be expanding support
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for [additional metrics](https://gitlab.com/gitlab-org/gitlab-ee/issues/4370)
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in a future release.
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Going a step further, GitLab can show the Performance report right
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in the merge request widget area:
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## Use cases
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For instance, consider the following workflow:
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1. A member of the marketing team is attempting to track engagement by adding a new tool
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1. With browser performance metrics, they see how their changes are impacting the usability of the page for end users
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1. The metrics show that after their changes the performance score of the page has gone down
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1. When looking at the detailed report, they see that the new Javascript library was included in `<head>` which affects loading page speed
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1. They ask a front end developer to help them, who sets the library to load asynchronously
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1. The frontend developer approves the merge request and authorizes its deployment to production
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## How it works
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First of all, you need to define a job in your `.gitlab-ci.yml` file that generates the
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[Performance report artifact](../../../ci/yaml/README.md#artifactsreportsperformance-premium).
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For more information on how the Performance job should look like, check the
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example on [Testing Browser Performance](../../../ci/examples/browser_performance.md).
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GitLab then checks this report, compares key performance metrics for each page
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between the source and target branches, and shows the information right on the merge request.
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>**Note:**
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If the Performance report doesn't have anything to compare to, no information
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will be displayed in the merge request area. That is the case when you add the
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Performance job in your `.gitlab-ci.yml` for the very first time.
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Consecutive merge requests will have something to compare to and the Performance
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report will be shown properly.
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![Performance Widget](img/browser_performance_testing.png)
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2019-09-04 21:01:54 +05:30
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<!-- ## Troubleshooting
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Include any troubleshooting steps that you can foresee. If you know beforehand what issues
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one might have when setting this up, or when something is changed, or on upgrading, it's
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important to describe those, too. Think of things that may go wrong and include them here.
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This is important to minimize requests for support, and to avoid doc comments with
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questions that you know someone might ask.
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Each scenario can be a third-level heading, e.g. `### Getting error message X`.
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If you have none to add when creating a doc, leave this section in place
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but commented out to help encourage others to add to it in the future. -->
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