perf.html visualizes performance data recorded from web browsers. It is a tool designed to consume performance profiles from the Gecko Profiler but can visualize data from any profiler able to output in JSON. The interface is a web application built using React and Redux and runs entirely client-side.

Mozilla develops this tool to help make Firefox silky smooth and fast for millions of its users, and to help make sites and apps faster across the web.

This project was previously called Cleopatra.

Visit perf-html.io 🚀

This project is live on https://perf-html.io/. The website includes instructions on how to get going to start recording and viewing performance profiles.

You will need a recent enough version of Yarn, version 1.0.1 is known to work correctly. You can install it into your home directory on Linux and probably OS X with:

cd /tmp
wget https://yarnpkg.com/install.sh
chmod a+x install.sh
./install.sh

To download and build perf.html run:

git clone [email protected]:devtools-html/perf.html.git
cd perf.html
yarn install
yarn start

For more detailed information on getting started contributing. We have plenty of docs available to get you started.

Say hello on slack in the #perf channel.

MPL v2

Some permissive software licenses request but do not require an acknowledgement of the use of their software. We are very grateful to the following people and projects for their contributions to this product:

• The zlib compression library (Jean-loup Gailly, Mark Adler and team)