> For the complete documentation index, see [llms.txt](https://docs.does.qa/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.does.qa/better-coverage/test-page-performance.md).

# Test page performance

Assert a Lighthouse performance score on a page in your Flow.

Performance Checks score the page with Lighthouse while the journey is already open. Use them on key screens so slow loads fail the Run the same way a broken button would.

Use the **Flow Builder** for this walkthrough.

## Add a Performance Check

{% stepper %}
{% step %}

## Open the page

Start with [**Open**](/test-steps/starter/open.md). Continue with [**Touch**](/test-steps/action/touch.md) and other steps until the screen you care about is showing.
{% endstep %}

{% step %}

## Add Performance

From the [**Validator**](/test-steps/validator.md) family, add [**Performance**](/test-steps/validator/performance.md).

1. Choose a [Comparison Type](/test-step-options/comparison-type.md). The default is greater than or equal to.
2. Set **Value** to the score your team expects. The default is `85`.
   {% endstep %}

{% step %}

## Run and read the result

Start the Run. Open the Performance step in the result to see the score against your threshold.
{% endstep %}
{% endstepper %}

{% hint style="info" %}
**Pro tip:** Put Performance after the page has finished loading and after any login or consent steps. A score on a half-loaded screen is hard to trust.
{% endhint %}

You can add [**SEO**](/test-steps/validator/seo.md), [**Accessibility**](/test-steps/validator/accessibility.md), and other Lighthouse Validators on the same screen when you want several scores in one journey. See [Add accessibility checks](/better-coverage/add-accessibility-checks.md) and [Test SEO](/better-coverage/test-seo.md).

## Related

* [Performance](/test-steps/validator/performance.md)
* [SEO](/test-steps/validator/seo.md)
* [Accessibility](/test-steps/validator/accessibility.md)
* [Best Practices](/test-steps/validator/best-practices.md)
* [Add accessibility checks](/better-coverage/add-accessibility-checks.md)
* [Test SEO](/better-coverage/test-seo.md)