Sitespeed.io

sitespeed.iosite

Open-source tool that checks your site against web performance best practices and uses the Navigation Timing API to collect metrics. Outputs XML and HTML reports.

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Web Performance Optimization, PageSpeed Metrics, Web Performance Budget

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2026-10-10

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Web Performance Optimization › Metrics Monitor: “Open-source tool that checks your site against web performance best practices and uses the Navigation Timing API to collect metrics. Outputs XML and HTML reports.”

PageSpeed Metrics › Concepts > Lab Data (Synthetic Measurements): “A set of open source performance monitoring tools.”

Web Performance Budget › Tools to measure Performance Budget: “Easy to monitor and measure the performance of your web site.”