About Boomerang
Boomerang is an open-source JavaScript library that measures the page load performance experienced by real users, a technique known as real user monitoring (RUM). It was originally created at Yahoo! by Philip Tellis and is now maintained by Akamai.
What it measures:
Page load timings from the browser's Navigation Timing and Resource Timing APIs.
Core Web Vitals: Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift.
Single-page applications: timing of route changes in apps built with React, Angular or Vue.
Errors and network information such as bandwidth and latency.
After collecting the measurements, Boomerang sends them as a beacon to a server chosen by the website owner. It is the data collection library behind Akamai mPulse, which is why the two are often detected together, but it can also be used with any custom analytics backend.
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