Apart from page load time, boomerang measures performance timings, metrics and characteristics of your user’s web browsing experience. All you have to do is include it in your web pages and call the
BOOMR.init() method. Once the performance data is captured, it will be beaconed to your chosen URL.
boomerang is designed to be a performant and flexible library that can be adapted to your site’s needs. It has an extensive plugin architecture and works with both traditional and modern websites (including Single Page Apps).
Boomerang is opensource and released under the BSD license