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Simon Hearne

Web Performance Consultant

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Web Performance Tools

Tools that I’ve created

  • Heatmap - Generate a heatmap of a webpage showing which elements of the page are slow to render
  • Request Map - Plot the domains on a web page showing how they all connect to each other
  • Jank Meter - Measure how smoothly a page scrolls from a bookmarklet.

Other great tools

  • YellowLab Tools - visualise Javascript execution
  • CDN Finder - opensource tool to identify which CDN serves domains
  • REDbot - opensource tool to test resource headers