PageSpeed Metrics
A curated list of web performance metrics, tools, and concepts for measuring page speed and user experience.
What is PageSpeed Metrics?
Awesome Page Speed Metrics is a curated knowledge base and reference list for web performance metrics and measurement tools. It helps developers understand which metrics matter for user experience, how to measure them, and what tools are available for both lab testing and real-user monitoring. The project organizes complex performance concepts into an accessible format for learning and implementation.
Web developers, performance engineers, and DevOps professionals who need to measure, monitor, and optimize website speed and user experience. It's particularly useful for teams establishing performance budgets or implementing Core Web Vitals tracking.
It consolidates scattered performance documentation into a single, well-organized resource, saving time on research. Unlike generic articles, it provides direct links to specs, tools, and polyfills, making it a practical reference for implementing performance tracking.
Overview
⚡Metrics to help understand page speed and user experience
Use Cases
Best For
- Understanding and implementing Core Web Vitals (LCP, FID, CLS)
- Choosing between synthetic testing tools and Real User Monitoring (RUM) solutions
- Learning the difference between lab data and field data for performance analysis
- Finding polyfills and browser support information for newer performance APIs
- Setting up performance tracking with Google Analytics or other RUM providers
- Researching specific metrics like Speed Index, TTI, or TBT for optimization work
Not Ideal For
- Teams needing an out-of-the-box performance monitoring dashboard with real-time alerts
- Developers looking for automated code optimization suggestions or built-in testing tools
- Projects requiring interactive tutorials or step-by-step guides for beginners in web performance
- Organizations seeking a single, integrated solution for performance measurement and reporting
Pros & Cons
Pros
Covers all Core Web Vitals and additional metrics like Speed Index and TTI, with clear explanations and direct links to official specs, as detailed in the README sections for each metric.
Lists both synthetic testing tools (e.g., Lighthouse, WebPageTest) and RUM solutions (e.g., SpeedCurve, Akamai mPulse), helping users choose based on lab vs field data needs, as highlighted in the Concepts section.
Emphasizes metrics that reflect actual user experience over technical benchmarks, advocating for field data and real-user monitoring, as stated in the Philosophy and Concepts sections.
Provides code snippets, polyfill links, and browser support info for metrics like FID and TTFB, making it a practical reference for developers implementing performance tracking.
Cons
As a curated list, it relies on external links that can break or become outdated quickly in the fast-evolving web performance landscape, with no built-in update mechanism.
Lacks search, filtering, or interactive examples, making navigation cumbersome for users seeking specific information quickly without scrolling through the entire list.
May not cover every niche tool or emerging metric, so users might need to supplement with additional research, as it's confined to the author's curation.
Frequently Asked Questions
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