UX Rating tells you what share of your users are having a good experience — and where to look when they’re not.

Calibre Blog provides insights, tutorials, and updates on web performance optimization, front-end development, and website monitoring. Covering topics such as performance metrics, image optimization, and page speed analysis, Calibre Blog offers resources for developers and webmasters. Readers can learn about improving website performance, diagnosing performance issues, and optimizing user experience through Calibre's articles and performance optimization guides.

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Calibre's UX Rating metric answers a simple but critical question: what percentage of real users are having a good experience on your site? Unlike Lighthouse scores or APM dashboards, UX Rating evaluates full user sessions using Core Web Vitals and TTFB, bucketing experiences into Good, Needs Improvement, or Poor. The post explains how the Good% metric drives action across teams — from developers catching regressions to executives correlating it with NPS and conversion. A real-world example shows how a missing cache header dropped Calibre's own Good sessions from 85% to 34%, and how UX Rating helped pinpoint and fix the issue quickly.

UX Rating: How many of your users are having a good time?

Where UX Rating immediately paid off for Calibre #

UX Ratings create alignment and cut-through jargon #