webpagetest

Installation
SKILL.md

Analyze performance with WebPageTest

WebPageTest reveals real-world performance issues that synthetic tools miss—like TTFB from actual locations, render-blocking patterns, and third-party script impact.

Quick Reference

  • Run 3+ tests to get consistent results
  • Test from locations near your users
  • Use filmstrip view to identify visual progress
  • Check waterfall for blocking resources and slow third-parties

Check

Use WebPageTest to analyze page performance, identify bottlenecks, and measure real-world loading metrics across different devices and connections.

Fix

Implement recommended optimizations from WebPageTest results including resource compression, caching, and critical path improvements.

Installs
1
GitHub Stars
73.0K
First Seen
Jun 8, 2026
webpagetest — thedaviddias/frontendchecklist