Performance Analyzer

Analyze page load times, simulate different connection speeds, and get optimization suggestions

Overview

The Performance Analyzer helps you understand and optimize web page performance. Simulate different network conditions from 5G to slow 3G, calculate load times for various asset types, and get specific recommendations to improve speed and user experience.

Tips

  1. Test on 3G Connections: Most users in developed countries have 4G or better, but testing on 3G reveals performance issues that affect users in rural areas, developing countries, or congested networks.

  2. Set Performance Budgets: Target less than 200KB for JavaScript, 100KB for CSS, and 2MB total page weight. These limits ensure good performance even on slower connections.

  3. Optimize Images First: Images are typically the largest assets. Use WebP format, compress files, and implement lazy loading for images below the fold to see immediate performance gains.

  4. Target Core Web Vitals: Aim for LCP under 2.5s, FID under 100ms, and CLS under 0.1. These Google metrics directly impact search rankings and user experience.

  5. Remember Performance IS Accessibility: Slow load times disproportionately affect users on older devices, limited data plans, and slower networks - making performance an accessibility issue.