Perfume.js - Web performance library for measuring all User-centric performance metrics

Perfume is a JavaScript library for measuring Short and Long Script, First Contentful Paint (FCP), Time to Interactive (TTI), Component First Paint (CFM), annotating them to the DevTools timeline and reporting the results to Google Analytics.When a user navigates to a web page, they're typically looking for visual feedback to reassure them that everything is going to work as expected. Page Speed is a feature, and to deliver it we need to understand the many factors and fundamental limitations that are at play. If we can measure it, we can improve it.