Google PageSpeed Insights

Page speed scores, Core Web Vitals and SEO scores

Check web page speed and quality on mobile and desktop.

Check page speed

Check page speed

Test a web page for speed, accessibility, best practices and SEO on mobile or desktop. Real-user data and savings estimates appear only when available; tests may take up to 60 seconds.

Your information

Page URL

Address of the page to test, such as example.com.

More options

DeviceOptional

Device type, such as mobile.

1 credit per completed run

The same inputs also work from your code or an AI assistant. See For developers.

Example results

100/100 performance score

Accessibility96out of 100

Best practices100out of 100

SEO80out of 100

mobile test, example.com

Speed index1 sec

First contentful paint1 sec

Largest contentful paint1 sec

Blocking time0milliseconds

Real-user experience

Data scope: URL
Core Web Vitals passed: Yes
Largest contentful paint: 1 sec
Interaction to next paint: 80
Layout shift: 0

Use efficient cache lifetimes
Est savings of 2 KiB
Network dependency tree

View full PageSpeed report Open tested page

About the Google PageSpeed Insights tool

Google PageSpeed Insights, also called Google PSI, tests web pages for speed, accessibility, best practices and SEO on mobile or desktop.

Built from pagespeed.web.dev. Last checked Sep 30, 2026.

Actions

Check page speed

1 credit

Test a web page for speed, accessibility, best practices and SEO on mobile or desktop. Real-user data and savings estimates appear only when available; tests may take up to 60 seconds.

What you provide

Field	Type	Required	Description
Device`device`	Text	Optional	Device type, such as mobile.Example: Desktop
Page URL`page_url`	Text	Required	Address of the page to test, such as example.com.Example: example.com

What you get

Field	Type	Description
Device`device`	Text	Device type tested.Example: Mobile
Seo Score`seo_score`	Number	SEO score out of 100.Example: 80
Lab Results`lab_results`	Details	Results measured by Lighthouse.
Speed Index (seconds)`lab_results.speed_index_seconds`	Number	Lab speed index in seconds.Example: 0.783
Total Blocking Time (ms)`lab_results.total_blocking_time_ms`	Number	Lab total blocking time in milliseconds.Example: 0
First Contentful Paint (seconds)`lab_results.first_contentful_paint_seconds`	Number	Lab first contentful paint in seconds.Example: 0.783
Largest Contentful Paint (seconds)`lab_results.largest_contentful_paint_seconds`	Number	Lab largest contentful paint in seconds.Example: 0.783
Report Link`report_link`	Text	Link to the full PageSpeed Insights report.Example: https://pagespeed.web.dev/analysis/https-example-com/eu9v402hfw?form_factor=mob…
Tested Link`tested_link`	Text	Final page address tested.Example: https://example.com/
Suggested Fixes`suggested_fixes`	List	Up to five relevant suggested fixes.
Fix`suggested_fixes[].fix`	Text	Suggested improvement.Example: Use efficient cache lifetimes
Estimated Saving`suggested_fixes[].estimated_saving`	Text	Estimated saving shown by PageSpeed, if any.Example: Est savings of 2 KiB
Performance Score`performance_score`	Number	Performance score out of 100.Example: 100
Real User Results`real_user_results`	Details	Real-user experience when available.
Scope`real_user_results.scope`	Text	Whether data describes the URL or its origin.Example: URL
Passed`real_user_results.passed`	Yes or no	Whether Core Web Vitals passed.Example: Yes
Cumulative Layout Shift`real_user_results.cumulative_layout_shift`	Number	Real-user cumulative layout shift.Example: 0
Interaction to Next Paint (ms)`real_user_results.interaction_to_next_paint_ms`	Number	Real-user interaction to next paint in milliseconds.Example: 80
Largest Contentful Paint (seconds)`real_user_results.largest_contentful_paint_seconds`	Number	Real-user largest contentful paint in seconds.Example: 0.941
Accessibility Score`accessibility_score`	Number	Accessibility score out of 100.Example: 96
Best Practices Score`best_practices_score`	Number	Best practices score out of 100.Example: 100

Example result

For Page URL: example.com

JSON

{
  "device": "mobile",
  "seo_score": 80,
  "lab_results": {
    "speed_index_seconds": 0.783,
    "total_blocking_time_ms": 0,
    "first_contentful_paint_seconds": 0.783,
    "largest_contentful_paint_seconds": 0.783
  },
  "report_link": "https://pagespeed.web.dev/analysis/https-example-com/eu9v402hfw?form_factor=mobile",
  "tested_link": "https://example.com/",
  "suggested_fixes": [
    {
      "fix": "Use efficient cache lifetimes",
      "estimated_saving": "Est savings of 2 KiB"
    },
    {
      "fix": "Network dependency tree",
      "estimated_saving": null
    }
  ],
  "performance_score": 100,
  "real_user_results": {
    "scope": "URL",
    "passed": true,
    "cumulative_layout_shift": 0,
    "interaction_to_next_paint_ms": 80,
    "largest_contentful_paint_seconds": 0.941
  },
  "accessibility_score": 96,
  "best_practices_score": 100
}

For developers

Call it from your code with one request. Change the values in input to run it on new data. To get an API key, open Developers at the bottom of Studio, turn on Developer mode and go to API keys.

cURL

curl 'https://api.fous.com/v1/query' \
  --fail-with-body --silent --show-error --max-time 180 \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H 'Content-Type: application/json' \
  --data-raw '{
  "api": "@google-pagespeed-insights",
  "visibility": "public",
  "operation": "check_page_speed",
  "version": 1,
  "input": {
    "page_url": "example.com"
  },
  "response": {
    "format": "json"
  }
}'

What you can do with it

Compare page speed scores on mobile and desktop.
Review accessibility and best practices scores for a web page.
Check whether real-user Core Web Vitals passed when data is available.
Prioritize page improvements using suggested fixes and estimated savings.
Check a page’s SEO score.

Questions about Google PageSpeed Insights

Can I run it with my own inputs?

Yes. Change the inputs in Studio and press Run, or send new inputs from your code, or ask a connected AI assistant.

Can I call this Google PageSpeed Insights tool as an API?

Yes. Send a POST request to /v1/query with your Fous API key and the inputs, and get JSON back.

How much does it cost?

Each completed run costs 1 credit. Failed runs without a completed receipt are free; completed work can remain charged if delivery is interrupted. With pay as you go, a credit costs 1¢. Monthly plans cost less per credit.

Do I need a Google PageSpeed Insights account?

No. You only need a Fous account.

How current is the data?

Fous gets the data from pagespeed.web.dev when you run it. Some results are reused for up to 24 hours, and results that use your account or key are never reused. It was last verified on Sep 30, 2026.