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Harry Roberts

@csswizardry.com

197 Following6.4k Followers

🚀 Independent Web Performance Consultant • Speaker • Google Developer Expert, Web Performance • Accepting new clients • https://harry.is/for-hire

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@csswizardry.comOct 7, 2026, 2:19 PM

and yes!

@csswizardry.comOct 7, 2026, 2:19 PM

Yes

@csswizardry.comOct 7, 2026, 11:16 AM

Everything else aside, it’s poor branding. We never called Sass ‘CSS-in-Ruby’ for good reason.

@csswizardry.comOct 7, 2026, 9:21 AM

One of the healthiest things a developer can do when faced with a bug or regression is doubt themselves first, but sometimes it’s something completely out of your hands.

@csswizardry.comOct 7, 2026, 9:04 AM

Two of my favourite opening slides from my ongoing work with LEGO. Sometimes, site-speed really is a *them* problem. It’s a function of your work and your audience, and one, both, or neither can move the needle.

Slide reading ‘Key takeaway: site-speed happens somewhere between you and your customers’A slide showing a network graph of devices connected to a web server, requesting a web page. Each connected node (device) and edge (HTTP connection) is annotated with a ‘thing’ that could harm performance, e.g. logged in state of the customer, flaky connections, rouge third parties in the browser, CDN outage or issue, different geographic locale.
@csswizardry.comOct 5, 2026, 10:06 PM

Your site seems very broken. For me, there is no content on either your home or contact pages and your social links just point to the platforms’ homepages.

@csswizardry.comOct 5, 2026, 8:43 AM

It’s a real shame that folk a decade ago weren’t warning developers against utterly insane things like CSS-in-J —  oh.

@csswizardry.comOct 1, 2026, 6:39 PM

🇬🇧 ✈️ 🇳🇱
Just landed in Schiphol ready for @fronteers.bsky.social Dark Mode tomorrow!

@csswizardry.comSep 30, 2026, 9:49 AM

#WebPerfWednesday 11 is out, in which we fix a longstanding bug in @speedcurve.com, and Safari gets network throttling! csswizardry.com/2026/09/web-...

@csswizardry.comSep 28, 2026, 5:18 PM

Tomorrow, I’m starting a new project with LEGO. Look how excited I am!

An AI rendering of Harry Roberts as a LEGO man. He’s wearing a pink shirt and dark jeans and is gesturing as though speaking/presenting.
@csswizardry.comSep 17, 2026, 2:21 PM

What is Time to First Byte and what can you do about it? csswizardry.com/2019/08/time...

@csswizardry.comSep 14, 2026, 3:37 PM

Stunning event!

@csswizardry.comSep 14, 2026, 10:15 AM

Are you getting the most out of your Speculation Rules? Probably not! csswizardry.com/2024/12/a-la...

@csswizardry.comSep 11, 2026, 1:04 PM

If you’re tracking your Core Web Vitals with synthetic, you probably also want to track your Total Blocking Time window: csswizardry.com/2026/06/fron...

@csswizardry.comSep 10, 2026, 2:47 PM

The reason this has been absent for so long is that @csswizardry.com is built on Jekyll which has no first class support for categories and tags, so I’m especially proud of this: csswizardry.com/blog/tags/

@csswizardry.comSep 10, 2026, 2:45 PM

Over the last day or so, Codex and I have been working on adding a proper taxonomy and associated categories and tags to the blog. Finally, @csswizardry.com has a proper archive! csswizardry.com/blog/

@csswizardry.comSep 10, 2026, 9:03 AM

Another day, another compelling use case for `No-Vary-Search`! csswizardry.com/2026/05/bett...

@csswizardry.comSep 9, 2026, 10:03 AM

I have ChatGPT read my `.vimrc` and send me a daily #Vim tip to read with my morning coffee.

@csswizardry.comSep 4, 2026, 1:25 PM

I’ve always had a very good habit of `[TAGGING]` things like calendar events or Jira titles and the like — it makes it so much easier to find arbitrary topics with simple grep or search. It turns out it’s *incredibly* useful in this agentic world!

@csswizardry.comSep 3, 2026, 8:26 PM

That’s the key feature for me for definite. It’s an almost-hands free process!

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