{"repo":"sitespeedio/sitespeed.io","free":true,"listed":false,"github":"https://github.com/sitespeedio/sitespeed.io","clone":"git clone https://github.com/sitespeedio/sitespeed.io.git","description":"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.","language":"JavaScript","stars":5013,"topics":["web","metrics","monitoring","webperf","perfmatters","performance-metrics","performance-analysis","performance-dashboard","sitespeed"],"license":"MIT","category":"analytics","readme_excerpt":"sitespeed.io [![Downloads][downloads-image]][downloads-url] [![Docker][docker-image]][docker-url] [![Stars][stars-image]][stars-url] [![npm][npm-image]][npm-url] [![Changelog #212][changelog-image]][changelog-url] Website Documentation Changelog Bluesky Mastodon Table of Contents - What is sitespeed.io? - Documentation - Installation - Docker - NodeJS - Usage - Basic usage - Advanced configuration - Mobile testing - Examples - Contributing - Reporting issues - Community - License What is sitespeed.io? sitespeed.io is an Open Source web performance tool. Run it once to debug a slow page and you get an HTML report with Core Web Vitals, a video of the page loading, the HAR waterfall and the Coach's advice on how to fix what's slow. Run it every hour against your site, ship the metrics to Graphite or InfluxDB, and you have a Grafana dashboard tracking your site's performance over time. It's been around since 2012, it's free, you own all your data, and there's nothing to sign up for. sitespeed.io drives a real browser — Firefox, Chrome, Edge, or Safari (including Safari on a real iPhone over USB) — to load your page, then collects: - Core Web Vitals — LCP, INP, CLS, TTFB and FCP, scored against Google's p75 thresholds. - A video and visual metrics — First Visual Change, Speed Index, Last Visual Change, plus a scrubable filmstrip. - The HAR waterfall — rendered with waterfall-tools. - The Coach's advice — a checklist of best-practice rules with severity, scores and concrete fixes. ","default_branch":null,"files":null,"tree":[],"storefront":"/r/sitespeedio","claimed":false,"request_supported":{"post":"https://gitbuyer.com/r/sitespeedio/sitespeed.io/request-supported","requests":0},"note":"indexed from public GitHub; nothing is for sale on this page. Clone it from GitHub. Paid listings live at /search."}