About sitespeed.io
sitespeed.io is an open source web performance tool. It tests a page or a user journey and produces a detailed HTML report, and it can run on a schedule to track performance over time.
What it does
A single run loads your page in a browser and records Core Web Vitals, a video of the load and a HAR waterfall. The report includes advice on what to fix. For ongoing monitoring, metrics can be sent to Graphite or InfluxDB and shown in a dashboard such as Grafana. Scripts let you test multi-step user journeys.
Key features
- HTML report with Core Web Vitals
- Video of the page loading
- HAR waterfall of network requests
- Scripting for user journeys
- Metrics sent to Graphite or InfluxDB
Who it's for
Front end developers, performance engineers and site owners who want to debug a slow page or monitor a site over time. Teams that prefer tools they can run themselves will find it a good fit.
Pricing and good to know
It is free and MIT licensed, and it runs from Docker or npm. You keep your data, and there is no sign-up. You need the browser you want to test with installed, and Firefox, Chrome, Edge and Safari are supported.
Highlights
- HTML report with Core Web Vitals
- Video of the page loading
- HAR waterfall of network requests
- Scripting for user journeys
- Metrics sent to Graphite or InfluxDB
