PageGym
PageGym is a web performance testing and optimization tool designed to analyze website load speeds, inspect Time to First Byte (TTFB), detect render blocking resources, and identify layout shift issues. It features a side-by-side comparison tool to evaluate performance changes between tests and includes a built-in experiment utility to test optimization strategies without modifying underlying source code.
Checked on Oct 18, 2026.
Alternative resources
Lighthouse
Automated open-source tool for improving the quality of web pages with audits for performance, accessibility, SEO, and progressive web apps.
Axiom
Agent-native observability platform for logs, metrics, traces, and events at petabyte scale.
PageGuard
Website auditing tool for performance, accessibility, SEO, and best practices, providing AI-interpreted reports based on Google Lighthouse.