GTmetrix is a website performance testing tool that analyzes how fast a webpage loads and provides detailed optimization recommendations. It measures key metrics like page load time, Core Web Vitals, page size, requests, and performance scores (using Google Lighthouse and other engines).

With GTmetrix, users can:

  • Test sites from different global locations
  • Simulate devices and connection speeds
  • Monitor performance over time
  • Get actionable insights to improve speed and user experience

It’s widely used for SEO, web development, and site optimization.