At the 2017 Chrome Web Summit Conference, Google introduced the world to the Chrome User Experience Report (CrUX) a database constructed from multiple samples pulled from real Chrome users web browsing experiences. According to Google, the goal was to capture the full range of external factors that shape and contribute to the final user experience.
A few short months later, Google updated their PageSpeed Insights tool to score two separate categories: speed and optimization. The familiar PageSpeed Insights grade based on technical issues and Googles recommended fixes was moved to the Optimization section, while the newly-introduced Page Speed section started labeling webpages as fast, average, or slow based on the median value of ones First Contentful Paint (FCP) and DOM Content Loaded (DCL).
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