Google PageSpeed Insights

Measure how fast a web page loads with Google PageSpeed Insights, and get its performance, accessibility, best practices and SEO scores.

Analyze webpage

Run a Google PageSpeed Insights (Lighthouse) analysis of a web page and get back its scores, Core Web Vitals and the audits it failed.

Inputs

Page URLurltextRequired: The web address of the page to analyze, for example https://example.com. The page has to be reachable publicly, because Google loads it from its own servers.
Devicestrategytext: Which device to measure the page on. Mobile is what Google uses for Search ranking.One of: mobile (Mobile (what Google uses for Search ranking)), desktop. Default: mobile.
Report oncategoriestext: Which parts of the page to report on. Each one adds to how long the analysis takes. Leave empty for Performance only.One or more of: performance, accessibility, best-practices (Best Practices), seo.
Report languagelocaletext: The language to write the audit titles and descriptions in. Scores and measurements are the same in every language.One of: ar (Arabic (ar)), bg (Bulgarian (bg)), ca (Catalan (ca)), hr (Croatian (hr)), cs (Czech (cs)), da (Danish (da)), nl (Dutch (nl)), en-GB (English (United Kingdom) (en-GB)), en-US (English (United States) (en-US)), fil (Filipino (fil)), and 35 more. Default: en-US.

Outputs

analyzed_attext: When the analysis ran, in UTC.
failed_audit_countnumber: How many audits failed in total, including any beyond the 50 listed.
failed_auditslist: The audits this page did not pass, the ones that would save the most load time first. Capped at 50.
field_dataobject
lab_metricsobject: What Lighthouse measured in its own test browser.
lighthouse_versiontext: The version of Lighthouse that scored the page.
localetext: The language the report was written in.
origin_field_dataobject: The same real-visitor data for the whole site rather than this one page.
performance_scorenumber: The performance score from 0 to 100, repeated here because it is the one most workflows act on. Empty when Performance was not reported on.
report_urltext: A link that opens this analysis in full on pagespeed.web.dev.
requested_urltext: The address that was submitted.
scoresobject: A score from 0 to 100 for each part that was reported on.
strategytext: The device that was measured, mobile or desktop.
urltext: The page that was actually measured, after any redirects.
warningslist: Anything Lighthouse flagged about the run itself, such as an unusually slow page.

Example output

{
  "analyzed_at": "2026-08-21T17:04:11.492Z",
  "failed_audit_count": 2,
  "failed_audits": [
    {
      "category": "performance",
      "description": "Resources are blocking the first paint of your page.",
      "display_value": "Potential savings of 480 ms",
      "estimated_savings_ms": 480.0,
      "id": "render-blocking-resources",
      "score": 42,
      "title": "Eliminate render-blocking resources"
    },
    {
      "category": "seo",
      "description": "Meta descriptions may be included in search results to concisely summarize page content.",
      "display_value": "",
      "estimated_savings_ms": 0.0,
      "id": "meta-description",
      "score": 0,
      "title": "Document does not have a meta description"
    }
  ],
  "field_data": {
    "available": true,
    "metrics": {
      "cumulative_layout_shift": {
        "rating": "FAST",
        "unit": "score",
        "value": 0.05
      },
      "interaction_to_next_paint_ms": {
        "rating": "FAST",
        "unit": "ms",
        "value": 168.0
      },
      "largest_contentful_paint_ms": {
        "rating": "AVERAGE",
        "unit": "ms",
        "value": 2604.0
      }
    },
    "overall_category": "AVERAGE"
  },
  "lab_metrics": {
    "cumulative_layout_shift": {
      "display_value": "0.014",
      "score": 100,
      "unit": "score",
      "value": 0.014
    },
    "first_contentful_paint_ms": {
      "display_value": "1.8 s",
      "score": 88,
      "unit": "ms",
      "value": 1834.2
    },
    "largest_contentful_paint_ms": {
      "display_value": "2.9 s",
      "score": 71,
      "unit": "ms",
      "value": 2941.7
    },
    "speed_index_ms": {
      "display_value": "2.4 s",
      "score": 86,
      "unit": "ms",
      "value": 2410.5
    },
    "total_blocking_time_ms": {
      "display_value": "210 ms",
      "score": 79,
      "unit": "ms",
      "value": 210.0
    }
  },
  "lighthouse_version": "12.6.0",
  "locale": "en-US",
  "origin_field_data": {
    "available": true,
    "metrics": {
      "largest_contentful_paint_ms": {
        "rating": "FAST",
        "unit": "ms",
        "value": 2180.0
      }
    },
    "overall_category": "FAST"
  },
  "performance_score": 84,
  "report_url": "https://pagespeed.web.dev/analysis?url=https%3A%2F%2Fexample.com&form_factor=mobile",
  "requested_url": "https://example.com",
  "scores": {
    "performance": 84,
    "seo": 92
  },
  "strategy": "mobile",
  "url": "https://example.com/",
  "warnings": []
}

Google PageSpeed Insights

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Inputs

Outputs

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Analyze webpage