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Tag: Resource Loading

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Concatenate, compress, cache, and load in the right order. Getting critical resources to the browser before it knows it needs them.


2026


  1. When All You Can Do Is All or Nothing, Do Nothing

2024


  1. A Layered Approach to Speculation Rules

  2. Optimising for High Latency Environments

  3. blocking=render: Why would you do that?!

2023


  1. Correctly Configure (Pre) Connections

  2. The Three Cs: 🤝 Concatenate, 🗜️ Compress, 🗳️ Cache

  3. The Ultimate Low-Quality Image Placeholder Technique

  4. The HTTP/1-liness of HTTP/2

  5. Why Not document.write()?

2022


  1. Speeding Up Async Snippets

  2. Critical CSS? Not So Fast!

  3. Optimising Largest Contentful Paint

2020


  1. Speed Up Google Fonts

  2. Real-World Effectiveness of Brotli

2019


  1. Lazy Pre-Browsing with Prefetch

  2. Making Cloud.typography Fast(er)

  3. Self-Host Your Static Assets

2018


  1. What If?

  2. CSS and Network Performance

  3. Image Inconsistencies: How and When Browsers Download Images

2017


  1. The Fallacies of Distributed Computing (Applied to Front-End Performance)

  2. Base64 Encoding & Performance, Part 2: Gathering Data

  3. Base64 Encoding & Performance, Part 1: What’s Up with Base64?

2016


  1. Improving Perceived Performance with Multiple Background Images

2013


  1. Front-end performance for web designers and front-end developers

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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.