fastmon

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fastmon is a real user monitoring platform that measures website performance on actual devices and networks. The software captures Core Web Vitals such as Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift, evaluated at the 75th percentile against established thresholds. The platform tracks network timing data, including DNS resolution, TCP connection, TLS handshake, server response time, and resource transfer phases, with waterfall visualizations to identify bottlenecks. JavaScript error tracking identifies production errors by type, frequency, and origin. fastmon offers cookie-free web analytics for visitor counts, traffic sources, and campaign attribution. Hosted entirely in the EU, the platform ensures European data residency, removes IP addresses at the edge, and retains only country-level location data. Installation involves adding a lightweight script that uses browser APIs. Synthetic monitoring via Lighthouse audits complements real user data.