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Not So Fast!", "url": "https://csswizardry.com/2022/09/critical-css-not-so-fast/", "published_at": "2022-09-06T16:00:00+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd365f73dc1", "title": "Measure What You Impact, Not What You Influence", "url": "https://csswizardry.com/2022/08/measure-what-you-impact-not-what-you-influence/", "published_at": "2022-08-24T12:41:16+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd3662dfadd", "title": "Optimising Largest Contentful Paint", "url": "https://csswizardry.com/2022/03/optimising-largest-contentful-paint/", "published_at": "2022-03-28T23:02:11+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd366825a1d", "title": "Measuring Web Performance in Mobile Safari", "url": "https://csswizardry.com/2021/02/measuring-network-performance-in-mobile-safari/", "published_at": "2021-02-26T01:41:12+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd3674d1514", "title": "Site-Speed Topography", "url": "https://csswizardry.com/2020/11/site-speed-topography/", "published_at": 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"2018-10-27T10:02:39+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd36d6b57b2", "title": "Getting to Know a Legacy Codebase", "url": "https://csswizardry.com/2018/07/getting-to-know-a-legacy-codebase/", "published_at": "2018-07-21T13:02:54+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd36decbb18", "title": "Image Inconsistencies: How and When Browsers Download Images", "url": "https://csswizardry.com/2018/06/image-inconsistencies-how-and-when-browsers-download-images/", "published_at": "2018-06-11T19:02:54+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd36e80c150", "title": "Identifying, Auditing, and Discussing Third Parties", "url": "https://csswizardry.com/2018/05/identifying-auditing-discussing-third-parties/", "published_at": "2018-05-21T10:01:21+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd36ec4e003", "title": "My Digital Music Setup", "url": "https://csswizardry.com/2018/04/my-digital-music-setup/", "published_at": "2018-04-02T16:35:19+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd36f43fecb", "title": "Measuring the Hard-to-Measure", "url": "https://csswizardry.com/2018/03/measuring-the-hard-to-measure/", "published_at": "2018-03-01T13:45:19+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd36ff22cfe", "title": "Finding Dead CSS", "url": "https://csswizardry.com/2018/01/finding-dead-css/", "published_at": "2018-01-17T14:25:19+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd37015d3c7", "title": "The Fallacies of Distributed Computing (Applied to Front-End Performance)", "url": "https://csswizardry.com/2017/11/the-fallacies-of-distributed-computing-applied-to-front-end-performance/", "published_at": "2017-11-21T09:51:11+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd370215981", "title": "Ten Years Old", "url": "https://csswizardry.com/2017/11/ten-years-old/", "published_at": "2017-11-19T00:00:00+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd3702cc8d8", "title": "Relative Requirements", "url": "https://csswizardry.com/2017/11/relative-requirements/", "published_at": "2017-11-10T18:23:12+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd3704da7e7", "title": "Airplanes and Ashtrays", "url": "https://csswizardry.com/2017/10/airplanes-and-ashtrays/", "published_at": "2017-10-30T12:53:49+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd371186c74", "title": "Performance and Resilience: Stress-Testing Third Parties", "url": "https://csswizardry.com/2017/07/performance-and-resilience-stress-testing-third-parties/", "published_at": "2017-07-31T16:10:13+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd371c3d80e", "title": "Refactoring Tunnels", "url": "https://csswizardry.com/2017/06/refactoring-tunnels/", "published_at": "2017-06-02T12:19:58+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd372b3fcf3", "title": "Little Things I Like to Do with Git", "url": "https://csswizardry.com/2017/05/little-things-i-like-to-do-with-git/", "published_at": "2017-05-23T14:39:29+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd3735f0140", "title": "Writing Tidy Code", "url": "https://csswizardry.com/2017/05/writing-tidy-code/", "published_at": "2017-05-10T12:45:56+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd3744df734", "title": "Configuring Git and Vim", "url": "https://csswizardry.com/2017/03/configuring-git-and-vim/", "published_at": "2017-03-16T21:41:11+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd374fec52b", "title": "Base64 Encoding & Performance, Part 2: Gathering Data", "url": "https://csswizardry.com/2017/02/base64-encoding-and-performance-part-2/", "published_at": "2017-02-12T15:47:21+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd3759b7cba", "title": "Base64 Encoding & Performance, Part 1: What’s Up with Base64?", "url": "https://csswizardry.com/2017/02/base64-encoding-and-performance/", "published_at": "2017-02-12T12:11:13+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd37639e1e2", "title": "Code Smells in CSS Revisited", "url": "https://csswizardry.com/2017/02/code-smells-in-css-revisited/", "published_at": "2017-02-08T12:14:18+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd3768eda3c", "title": "Typography for Developers", "url": "https://csswizardry.com/2017/02/typography-for-developers/", "published_at": "2017-02-06T22:22:34+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd3777dc3d4", "title": "Moving CSS Wizardry onto HTTPS and HTTP/2", "url": "https://csswizardry.com/2017/01/moving-css-wizardry-onto-https-and-http-2/", "published_at": "2017-01-25T11:45:58+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd377a664a3", "title": "Ack for CSS Developers", "url": "https://csswizardry.com/2017/01/ack-for-css-developers/", "published_at": "2017-01-17T19:07:24+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd377d56b3f", "title": "A New Year, a New Focus", "url": "https://csswizardry.com/2017/01/a-new-year-a-new-focus/", "published_at": "2017-01-09T21:44:13+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd3789f099d", "title": "Preparing Vim for Apple’s Touch Bar", "url": "https://csswizardry.com/2017/01/preparing-vim-for-apples-touch-bar/", "published_at": "2017-01-08T22:30:47+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd379473f3a", "title": "Choosing the Correct Average", "url": "https://csswizardry.com/2017/01/choosing-the-correct-average/", "published_at": "2017-01-04T12:08:54+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd379547b5b", "title": "CSS Shorthand Syntax Considered an Anti-Pattern", "url": "https://csswizardry.com/2016/12/css-shorthand-syntax-considered-an-anti-pattern/", "published_at": "2016-12-12T14:11:38+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd37a410174", "title": "CSS Wizardry Newsletter", "url": "https://csswizardry.com/2016/11/css-wizardry-newsletter/", "published_at": "2016-11-30T17:27:11+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd37a986927", "title": "Nesting Your BEM?", "url": "https://csswizardry.com/2016/11/nesting-your-bem/", "published_at": "2016-11-28T12:50:39+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd37ac74e30", "title": "Improving Perceived Performance with Multiple Background Images", "url": "https://csswizardry.com/2016/10/improving-perceived-performance-with-multiple-background-images/", "published_at": "2016-10-23T22:53:18+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd37baa8401", "title": "Continue Normalising Your CSS", "url": "https://csswizardry.com/2016/10/continue-normalising-your-css/", "published_at": "2016-10-19T12:40:58+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd37bbfb407", "title": "Pure CSS Content Filter", "url": "https://csswizardry.com/2016/10/pure-css-content-filter/", "published_at": "2016-10-15T21:13:47+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd37c0cc888", "title": "Pragmatic, Practical, and Progressive Theming with Custom Properties", "url": "https://csswizardry.com/2016/10/pragmatic-practical-progressive-theming-with-custom-properties/", "published_at": "2016-10-10T19:25:19+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd37c3fc90d", "title": "Refactoring CSS: The Three I’s", "url": "https://csswizardry.com/2016/08/refactoring-css-the-three-i-s/", "published_at": "2016-08-30T20:11:12+00:00" }, { "id": "01a07df2-7b71-7096-b2ae-2bd37c48cb7d", "title": "Speaker’s Checklist: Before and After Your Talk", "url": "https://csswizardry.com/2016/06/speakers-checklist-before-and-after-your-talk/", "published_at": "2016-06-20T19:59:10+00:00" } ] posts Claim your blog

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Harry Roberts

csswizardry.com

2026

Web-Perf Wednesday 010 – Safari Keeps Scrolled Content in Place original ↗

23 Sept 2026

Web-Perf Wednesday 009 – CrUX Makes Ad Weight Public original ↗

16 Sept 2026

Web-Perf Wednesday 008 – Good INP Rates Keep Falling original ↗

9 Sept 2026

Web-Perf Wednesday 007 – Chrome Makes Busy Workers Measurable original ↗

2 Sept 2026

Web-Perf Wednesday 006 – Faster Browser Releases Change Your RUM Population original ↗

26 Aug 2026

How to Find an Exact Gmail Thread with Codex or Claude original ↗

20 Aug 2026

Unattributed Navigation Overhead (UNO) Is Underrated original ↗

20 Aug 2026

Web-Perf Wednesday 005 – RUM Needs More Than a Percentile original ↗

19 Aug 2026

Introducing LUX Sidecar: Your SpeedCurve Companion original ↗

18 Aug 2026

When Safari’s ‘Ignore Cache’ Ignored Cache-Control original ↗

17 Aug 2026

Web-Perf Wednesday 004 – A Quiet Week Is Time to Investigate original ↗

12 Aug 2026

Web-Perf Wednesday 003 – Native SPA Metrics Have Arrived original ↗

5 Aug 2026

Web-Perf Wednesday 002 – The Metrics Don’t Tell the Whole Story original ↗

29 Jul 2026

Measuring Component Performance with the Container Timing API original ↗

26 Jul 2026

Low- and Mid-Tier Mobile for the Real World (2026)original ↗

21 Jul 2026

Web-Perf Wednesday 001 – SPAs Are Finally Becoming Measurable original ↗

15 Jul 2026

Front-End’s Missing Metric: The TBT Window original ↗

1 Jun 2026

Meet Your Users Where They Are with Obs.js original ↗

12 May 2026

Better Browser Caching with No-Vary-Search original ↗

7 May 2026

font-family Doesn’t Fall Back the Way You Think original ↗

10 Apr 2026

What Is CSS Containment and How Can I Use It?original ↗

2 Apr 2026

When All You Can Do Is All or Nothing, Do Nothing original ↗

30 Mar 2026

2025

Obs.js: Context-Aware Web Performance for Everyone original ↗

27 Aug 2025

Low- and Mid-Tier Mobile for the Real World (2025)original ↗

18 Aug 2025

The Fastest Site in the Tour de France original ↗

27 Jul 2025

Making Sense of the Performance Extensibility API original ↗

25 Jul 2025

Why Do We Have a Cache-Control Request Header?original ↗

7 Mar 2025

HTML Is Not a Programming Language…original ↗

10 Feb 2025

Build for the Web, Build on the Web, Build with the Web original ↗

23 Jan 2025

2024

Licensing Code on CSS Wizardry original ↗

4 Dec 2024

A Layered Approach to Speculation Rules original ↗

2 Dec 2024

Designing (and Evolving) a New Web Performance Score original ↗

26 Nov 2024

Core Web Vitals Colours original ↗

18 Nov 2024

The Ultimate Contract Templates for Tech Consultants: Protect Your Business and Get Paid original ↗

1 Oct 2024

Optimising for High Latency Environments original ↗

16 Sept 2024

Cache Grab: How Much Are You Leaving on the Table?original ↗

19 Aug 2024

blocking=render: Why would you do that?!original ↗

14 Aug 2024

2023

Correctly Configure (Pre) Connections original ↗

9 Dec 2023

The Three Cs: 🤝 Concatenate, 🗜️ Compress, 🗳️ Cache original ↗

17 Oct 2023

What Is the Maximum max-age?original ↗

16 Oct 2023

How to Clear Cache and Cookies on a Customer’s Device original ↗

2 Oct 2023

The Ultimate Low-Quality Image Placeholder Technique original ↗

28 Sept 2023

Core Web Vitals for Search Engine Optimisation: What Do We Need to Know?original ↗

24 Jul 2023

The HTTP/1-liness of HTTP/2 original ↗

11 Jul 2023

In Defence of DOMContentLoaded original ↗

1 Jul 2023

Site-Speed Topography Remapped original ↗

7 Jun 2023

Why Not document.write()?original ↗

10 Jan 2023

2022

Speeding Up Async Snippets original ↗

12 Oct 2022

Critical CSS? Not So Fast!original ↗

6 Sept 2022

Measure What You Impact, Not What You Influence original ↗

24 Aug 2022

Optimising Largest Contentful Paint original ↗

28 Mar 2022

2021

Measuring Web Performance in Mobile Safari original ↗

26 Feb 2021

2020

Site-Speed Topography original ↗

3 Nov 2020

Speed Up Google Fonts original ↗

19 May 2020

Real-World Effectiveness of Brotli original ↗

22 Apr 2020

Performance Budgets, Pragmatically original ↗

8 Jan 2020

2019

Lazy Pre-Browsing with Prefetch original ↗

15 Aug 2019

Making Cloud.typography Fast(er)original ↗

13 Aug 2019

Time to First Byte: What It Is and How to Improve It original ↗

8 Aug 2019

Self-Host Your Static Assets original ↗

31 May 2019

Tips for Technical Interviews original ↗

25 Apr 2019

Cache-Control for Civilians original ↗

4 Mar 2019

Bandwidth or Latency: When to Optimise for Which original ↗

31 Jan 2019

2018

ITCSS × Skillshare original ↗

26 Nov 2018

What If?original ↗

23 Nov 2018

CSS and Network Performance original ↗

9 Nov 2018

The Three Types of Performance Testing original ↗

27 Oct 2018

Getting to Know a Legacy Codebase original ↗

21 Jul 2018

Image Inconsistencies: How and When Browsers Download Images original ↗

11 Jun 2018

Identifying, Auditing, and Discussing Third Parties original ↗

21 May 2018

My Digital Music Setup original ↗

2 Apr 2018

Measuring the Hard-to-Measure original ↗

1 Mar 2018

Finding Dead CSS original ↗

17 Jan 2018

2017

The Fallacies of Distributed Computing (Applied to Front-End Performance)original ↗

21 Nov 2017

Ten Years Old original ↗

19 Nov 2017

Relative Requirements original ↗

10 Nov 2017

Airplanes and Ashtrays original ↗

30 Oct 2017

Performance and Resilience: Stress-Testing Third Parties original ↗

31 Jul 2017

Refactoring Tunnels original ↗

2 Jun 2017

Little Things I Like to Do with Git original ↗

23 May 2017

Writing Tidy Code original ↗

10 May 2017

Configuring Git and Vim original ↗

16 Mar 2017

Base64 Encoding & Performance, Part 2: Gathering Data original ↗

12 Feb 2017

Base64 Encoding & Performance, Part 1: What’s Up with Base64?original ↗

12 Feb 2017

Code Smells in CSS Revisited original ↗

8 Feb 2017

Typography for Developers original ↗

6 Feb 2017

Moving CSS Wizardry onto HTTPS and HTTP/2 original ↗

25 Jan 2017

Ack for CSS Developers original ↗

17 Jan 2017

A New Year, a New Focus original ↗

9 Jan 2017

Preparing Vim for Apple’s Touch Bar original ↗

8 Jan 2017

Choosing the Correct Average original ↗

4 Jan 2017

2016

CSS Shorthand Syntax Considered an Anti-Pattern original ↗

12 Dec 2016

CSS Wizardry Newsletter original ↗

30 Nov 2016

Nesting Your BEM?original ↗

28 Nov 2016

Improving Perceived Performance with Multiple Background Images original ↗

23 Oct 2016

Continue Normalising Your CSS original ↗

19 Oct 2016

Pure CSS Content Filter original ↗

15 Oct 2016

Pragmatic, Practical, and Progressive Theming with Custom Properties original ↗

10 Oct 2016

Refactoring CSS: The Three I’s original ↗

30 Aug 2016

Speaker’s Checklist: Before and After Your Talk original ↗

20 Jun 2016