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Tag: Measurement

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2026


  1. Unattributed Navigation Overhead (UNO) Is Underrated

  2. Introducing LUX Sidecar: Your SpeedCurve Companion

  3. Web-Perf Wednesday 004 – A Quiet Week Is Time to Investigate

  4. Web-Perf Wednesday 002 – The Metrics Don’t Tell the Whole Story

  5. Measuring Component Performance with the Container Timing API

  6. Low- and Mid-Tier Mobile for the Real World (2026)

  7. Front-End’s Missing Metric: The TBT Window

2025


  1. Low- and Mid-Tier Mobile for the Real World (2025)

  2. The Fastest Site in the Tour de France

  3. Making Sense of the Performance Extensibility API

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Hi there, I’m Harry Roberts. I am an award-winning Consultant Web Performance Engineer, designer, developer, writer, and speaker from the UK. I write, Tweet, speak, and share code about measuring and improving site-speed. You should hire me.


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I help teams achieve class-leading web performance, providing consultancy, guidance, and hands-on expertise.

I specialise in tackling complex, large-scale projects where speed, scalability, and reliability are critical to success.