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Tag: Core Web Vitals

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LCP, INP, and CLS from someone who fixes them for a living. What the thresholds really mean, and how to move the numbers that matter.

2026


  1. Web-Perf Wednesday 008 – Good INP Rates Keep Falling

  2. Web-Perf Wednesday 003 – Native SPA Metrics Have Arrived

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

  4. Web-Perf Wednesday 001 – SPAs Are Finally Becoming Measurable

2025


  1. The Fastest Site in the Tour de France

2024


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

  2. Core Web Vitals Colours

2023


  1. The Ultimate Low-Quality Image Placeholder Technique

  2. Core Web Vitals for Search Engine Optimisation: What Do We Need to Know?

  3. Site-Speed Topography Remapped

2022


  1. Optimising Largest Contentful Paint

2020


  1. Site-Speed Topography

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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.

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