Martin Michalek

#WebPerf audits from #SEO agencies…

We’ve just added case studies to our company's website.

The results of our #WebPerformance work are pretty good. :)

For example, we sped up sites like SIKO and Footshop by more than 2.5×.

You’ll even find a few technical insights in there: pagespeed.cz/en/reference

This guy wants to work at 37signals — so he built a landing page and a pitch deck just for them. Brilliant.

By the way, we hired our newest team member at out company thanks to a similar approach.

Landing your dream job might be easier than you think.

37signals.kawaicheung.io

The Performance Inequality Gap, 2024 - Infrequently Noted How much HTML, CSS, and JavaScript can we afford? More than in years past, but much less than frontend developers are burdening users with.

A real eye-opener for prioritizing #WebPerformance?

Show your client their website on a low-end mobile device.

infrequently.org/2024/01/perf...

What do you think the rise of AI — like AI Overviews in Google — means for the web?

Extinction?
Transformation?
Opportunity?

Most people think optimizing #PageSpeed means:
> “Let’s remove stuff. Delete as much as we can.”

What it’s really about:
> “Keep what you need. Just build it the right way.”

This applies to everything: images, GTM, tracking tools, WordPress…

As #WebPerf people we do #optimization, not #deletion.

My #WebExpo2025: AI, WebPerf & People

— @tej.as – Web as food for AI, UI revolution
— Tomáš Čupr – CEOs, AI, FOMO
— @tammyeverts.com – Slow websites still hurt after users leave
— @tkadlec.bsky.social – Core Web Vitals are just the start

Thanks to Šárka and the @webexpo.bsky.social team!

Responsive Web Design Designers have coveted print for its precision layouts, lamenting the varying user contexts on the web that compromise their designs. Ethan Marcotte advocates we shift our design thinking to approp…

Today marks 15 years since @ethanmarcotte.com introduced “responsive web design.”

We decent web folks build for all devices now and don't think about it.

But in a time when websites are fighting for relevance, it’s worth looking back at those 15 years.
alistapart.com/article/resp...

You don’t say “I used a computer” to write something.

So why say “I used AI”?

It’s just a tool. Everyone’s using it.

I’ve got a team of assistants.

While I’m writing an email to a client, images for an article are being generated, data analysis is running, and a newsletter summary is being prepared.

#AI is turning all of us into managers.

Success will belong to those who delegate and prioritize well.

Yes, for devs/content/creative is AI huge, but it doesn't mean all of them will be replaced by AI tools.

They say 80% of programming will be done by #AI.

…say those who’ve mostly never written a line of code.

We all use low-end devices way too little. 📱

I think that’s one of the big issues of #WebDevelopment.

Today I browsed a few sites on an older mid-range Android, and it was a nightmare. 🙈

More context:
These are INP metric values from a Czech e-shop.
People also visit the site while traveling.

INP = the worse the device, the worse the metric.

The map shows where wealthier users vacation (green)
and where the larger crowds go (orange) — often with lower-end Androids.

#WebPerformance:

What hypotheses come to mind when you see a chart like this showing the geographic distribution of the INP metric?

Graph is is for Central European E-commerce site.

(I do have a strong hypothesis, but I’ll keep it to myself for now.)

Somebody told me MS Word has this feature too. Just copy Markdown and paste into document. Much better, but I don't use Word. 😅

Dark Reader — dark theme for every website Dark mode for every website. Take care of your eyes, use dark theme for night and daily browsing. For Chrome and Firefox, Edge and Safari.

OMG, how did I live without Dark Reader…!

This is a Chrome extension for darkening sites without dark mode. Google Docs, Gmail, whatever…

Everything is dark by default.

My eyes love it at the night. ✨

darkreader.org

In the interfaces of #SaaS apps, small performance or UX annoyances often cumulate over time.

Individually they’re not a big deal. The problem arises when they start to cumulate.

The challenge? Users will never report this in their feedback. They just get a “weird feeling”.

I love this.

Combined with #ChatGPT ability to generate #Markdown, “Paste into Markdown” is one of the best features of #GoogleDocs.

Markdown, once a format for programmers, is now like middleware for content.

I read somewhere that wanting a quick end to this war means supporting the wrong side.
Makes sense. 🇺🇦

YouTube video by Matthew Berman Microsoft CEO’s Shocking Prediction: “Agents Will Replace ALL Software"

Is B2B #SaaS in danger because of #AIagents?

I’ve been thinking about this for a few months.
I already have some thoughts on it… but first, I want to ask you:

Is B2B SaaS in danger because of AI agents? And why?

www.youtube.com/watch?v=uGOL...

According to this playbook, Europe has to remain weak — the U.S. and Russia will sort that out between themselves. They don't really care how.

This is a nightmare for us in Central Europe.

New world order looks like this now?

The U.S. under Trump now sees the world as bipolar: them versus China.

Russia is a second-tier power, but it’s better for the U.S. to have it on their side than on China’s.

Yes, in the same time, my collegue started to discover Ray-Bans' site and he is writing me, there are errors in the implementation.

Oh, those performance case studies… 🙈

Double site conversions with instant page loads?

Love this case study from Ray-Ban:
+43% faster LCP
+101% conversions on mobile

But beware. ☝️ It’s not a free performance boost – but when done right, results can be amazing.

🔗 Case study: web.dev/case-studies...

#SpeculationRules
#PageSpeed

Trying to work with #Gemini AI in our company’s Workspace.

The sidebar works great when working on Docs. It's not (yet) as good as #ChatGPT, but it's fast and has context.

I keep saying that Google is underrated in the AI world, but in the end it may be one the winners.

We in the Czech Republic love these houses.
Log cabins, we say "roubenky".
OMG, I already miss it.

Of course it’s a coup Miss the obvious, lose your republic

Of course it’s a coup. Miss the obvious, lose your republic.
open.substack.com/pub/snyder/p...

The abilities of many capable people are ruined by the inability to master the art of saying “NO.”

Are you competent? You’ll get more work.

And so it goes, until you become an incapable person.
Or until you start saying “NO”.

That’s why “NO” is such an important word.

SpeedJar – WebPerf Team & Newsletter We are an experienced team dedicated to helping organizations improve the speed of their websites

This week, we’re dropping the 2nd edition of our #WebPerf newsletter!

📬 Sign up now: www.speedjar.com

#PageSpeed #CoreWebVitals #WebPerformance