Automate running Lighthouse for every commit, viewing the changes, and preventing regressions

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.

📝 A curated list of Web Performance Optimization. Everyone can contribute here!

📉 Visualisation layer and data store for SpeedTracker

Reactive Extensions for Angular.

Headless Chromium-based web performance metrics collector and monitoring tool

A fast, flexible, and small SEO-friendly lazy loader.

Make optimisation of images part of your automated build process

Performance-Bookmarklet helps to analyze the current page through the Resource Timing API, Navigation Timing API and User-Timing - requests by type, domain, load times, marks and more. Sort of a light live WebPageTest.

"SQIP" (pronounced \skwɪb\ like the non-magical folk of magical descent) is a SVG-based LQIP technique.

Progressive web metrics at your fingertipz

⚡️ 💾 Web Performance Snippets

displays the import size of the package you are importing inside the code editor

Example how to use sitespeed.io to monitor the performance of your web site

Responsive, SVG based HAR waterfall viewer

Curated resources that help you build lightning fast websites

webperf-core is an open-source testing suite tailored to help you improve your digital presence in areas like web performance, security and accessibility to email best practice using many small improvements.

CSS selectors complexity and performance analyzer

Compare HAR files.