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Tag: Measurement

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You can’t fix what you can’t see. Metrics, methodologies, and sharper ways to measure what your users are genuinely experiencing.


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

2024


  1. Designing (and Evolving) a New Web Performance Score

  2. Cache Grab: How Much Are You Leaving on the Table?

2023


  1. In Defence of DOM­Content­Loaded

  2. Site-Speed Topography Remapped

2022


  1. Measure What You Impact, Not What You Influence

2021


  1. Measuring Web Performance in Mobile Safari

2020


  1. Site-Speed Topography

  2. Performance Budgets, Pragmatically

2019


  1. Time to First Byte: What It Is and How to Improve It

  2. Bandwidth or Latency: When to Optimise for Which

2018


  1. The Three Types of Performance Testing

  2. Identifying, Auditing, and Discussing Third Parties

  3. Measuring the Hard-to-Measure

  4. Finding Dead CSS

2017


  1. Choosing the Correct Average

2016


  1. Improving Your CSS with Parker

2014


  1. The Specificity Graph

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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.