# PageSpeed Insights

> Google's web performance testing tool analyzing Core Web Vitals and load speed.

PageSpeed Insights evaluates the performance of web pages on mobile and desktop devices. It generates 0-100 performance scores based on Core Web Vitals and lab data from Lighthouse. The tool provides actionable diagnostics and opportunities to fix asset bottlenecks and reduce load times.

Website: https://pagespeed.web.dev/

## What it is for

- Test Core Web Vitals for mobile and desktop versions of a website
- Identify render-blocking assets and oversized images slowing down page loads
- Audit technical SEO and site performance before launching updates

## Features

- Separate mobile and desktop performance reports
- Real-world field data from the Chrome User Experience Report (CrUX)
- Lab-based diagnostics powered by Lighthouse
- Core Web Vitals assessment including LCP, INP, and CLS
- Actionable optimization suggestions and estimated time savings

## Pricing

Free to use with no account required

## Details

- Type: Web app
- Category: [Development](https://xiry.app/topics/development.md)
- Open source: no
- Platforms: Web, API
- For: Web developers, SEO specialists, and site owners
- Alternative to: GTmetrix, Pingdom Website Speed Test, WebPageTest
- Tags: seo, web performance, core web vitals, auditing, google

## Why it was saved

- [@heytony.agency, 15 August 2023](https://www.instagram.com/reel/Cv-LZ0vMyTo/): Quickly pinpoints bottlenecks slowing down a website and recommends actionable optimizations like serving next-gen image formats.

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Updated 3 October 2026. Page: https://xiry.app/resources/pagespeed-insights

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