nemetric
Nemetric is a lightweight web performance monitoring library that collects and reports real user measurement metrics to analytics backends. It leverages modern W3C Performance APIs through PerformanceObserver to capture key performance indicators including First Paint (FP), First Contentful Paint (FCP), Largest Contentful Paint (LCP), First Input Delay (FID), and Time to Interactive (TTI). The library monitors navigation timing details such as DNS lookup time, fetch time, worker time, total request duration, download time, Time to First Byte (TTFB), HTTP header size, and total page load time. It also tracks resource timing, network information, and component lifecycle performance. Metrics can be customized and reported to any analytics service through a configurable tracker, enabling developers to visualize and analyze web performance across different geographic regions and user segments. Available via npm as the nemetric package, it can be imported as an ES module or used as a UMD bundle, making it suitable