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PageSpeed Insights Gatherer

Overview

For more details in the PageSpeed Insights API, please check out the official documentation.

Below is a sample Test with psi property that defines the configuration for running a WebPageTest audit.

{
  "label": "Example",
  "url": "https://examples.com",
  "gatherer": "psi",
  "psi": {
    "settings": {
      "locale": "en-GB",
      "strategy": "mobile"
    }
  }
}

Optional Environmental Variables

  • PSI_APIKEY - Use an API Key to relax rate limiting, for example if you see an error like:

Quota exceeded for quota metric 'Queries' and limit 'Queries per minute' of service 'pagespeedonline.googleapis.com' for consumer 'project_number:nnnn'."

See the official doc for details.

Audit Lifecycle

PageSpeed Insights API returns the metrics immediately after executing run action. Hence, there's no need to execute retrieve step.

Optionally, you may want to re-retrieve the metrics to a Result object by executing retrieve action.

Configuration details

Please see PageSpeed Insights API docs for details.

  • settings : The settings is an object that defines a list of parameters for running a PSI audit. See the following parameters for details.
  • settings.locale : The locale used to localize formatted result.
  • settings.strategy : The analysis strategy to use: desktop or mobile.
  • settings.category : The list of categories to run with Lighthouse: accessibility, best-practices, performance, pwa or seo, delimited with comma.

    • Run a Test and retrieve Metrics

    After running, the psi object in a Result object will contain the metrics object and its corresponding values, like below:

    {
  "label": "Example",
  "url": "https://examples.com",
  "status": "Retrieved",  
  "psi": {
    "status": "Retrieved",
    "statusText": "Success",
    "settings": {
      "locale": "en-GB",
      "strategy": "mobile"
    },
    "metadata": {
      "testId": "https://examples.com",
      "requestedUrl": "https://examples.com",
      "finalUrl": "https://examples.com",
      "lighthouseVersion": "6.0.0",
      "userAgent": "..."
    },
    "metrics": {
      "RenderBlockingResources": 56848,
      "crux": {
        "LargestContentfulPaint": {
          "category": "AVERAGE",
          "percentile": 3610,
          "good": 0.5500216829760357,
          "ni": 0.24342440183268282,
          "poor": 0.2065539151912815
        },
        ...
      },
      "lighthouse": {
        "FirstContentfulPaint": 700,
        "FirstMeaningfulPaint": 700,
        "LargestContentfulPaint": 1450,
        "SpeedIndex": 1417,
        ...
      }
    }
  }
}

    Please note that the metrics are grouped into several sub-properties, including crux and lighthouse. Each metric name here uses standardized metric name defined in src/common/metrics.js.

    Please see PageSpeed Insights API docs for full details of the metric definitions.