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LazyLoad is a lightweight (2.4 kB) and flexible script that speeds up your web application by deferring the loading of your below-the-fold images, videos and iframes to when they will enter the viewport. It's written in plain "vanilla" JavaScript, it leve
- lazyload
- vanilla
- responsive
- images
- picture
- srcset
- sizes
- native
- SEO
- intersectionObserver
- progressive
- performance
- perfmatters
- async
sitespeed.io is an open-source tool for comprehensive web performance analysis, enabling you to test, monitor, and optimize your website’s speed using real browsers in various environments.
Throttle your connection
Core package for the Coach.
Xray your HAR file and know all about the page
Lighthouse plugin for sitespeed.io
Create and compare web performance reports.
WebPerf plugin for sitespeed.io
LazyLoad is a lightweight (2.4 kB) and flexible script that speeds up your web application by deferring the loading of your below-the-fold images, videos and iframes to when they will enter the viewport. It's written in plain "vanilla" JavaScript, it leve
- lazyload
- vanilla
- responsive
- images
- picture
- srcset
- sizes
- native
- SEO
- intersectionObserver
- progressive
- performance
- perfmatters
- async
InfluxDB plugin for sitespeed.io
The coach gives you advice on building a better web page
Command Line Tool for CrUX Rest API
- CrUX
- CrUX API
- Chrome User Experience Report
- Chrome UX Report
- CrUX Report
- Core Web Vitals
- Web Performance
- FCP
- LCP
- CLS
- First Contentful Paint
- Largest Contentful Paint
- Cumulative Layout Shift
- webperformance
- View more
Convert blurhash strings to CSS objects
- blur
- blurhash
- hash
- image
- image loading
- image placeholder
- largest contentful paint
- perfmatters
- performance
- placeholder
- rust
- wasm
- web vitals
- webassembly
Analyze the web performance of your site using Grunt
Analyze the web performance of your site using Gulp
Browser instrumentation helper that makes it easier to capture UX speed metrics
Browser instrumentation helper that makes it easier to capture UX speed metrics
Performance measurment plugin for gulp based on Phantomas
- gulpplugin
- gulp
- perfmatters
- phantomas
- performance
- speed
- analyze
- website
- website performance tools
- website performance monitoring
- website performance metrics
- website performance optimization
- website performance analyzer
Analyze the web performance of your site
PSI report