#Chrome has been really slow lately. So I went to try #Safari again. I've only been using it for a day so I can't judge. But! I couldn't even last a day with my previous attempts. It seems to me that Apple has put a lot of effort into this browser in last year...?

Monitoring site speed? You need to know the acronyms: #synth, #CrUX, and #RUM. — Synthetic monitoring = machines (Lighthouse). — CrUX = real users in Google Chrome. — RUM = custom data from all users. Learn more here: pagespeed.one/en/know-how/... Which type do you use?

We at @pagespeedone.bsky.social have just launched a new website speed test. ⚡️ → pagespeed.one/en/app/insig...

At @pagespeedone.bsky.social we have launched a new service “Strategy for AI Bots”. AI bots are probably slowing down your websites too. We will come, discuss the data, set the rules so that the bots are fed up and you do not lose visibility in LLM. pagespeed.one/en/ai-bots #WebPerf #AI

Is Bluesky stagnating = slowly dying? bsky.jazco.dev/stats

Krkonoše. Weekend between the Czech Republic and Poland. Was good. ☀️

One of the biggest pitfalls of developing with LLM is bulk editing. It's temptingly simple, it edits beautifully contextually, including texts. But it often breaks something else and it's hard to control on a larger codebase.

Two days left to submit your talk for #FrontKon Prague's dev conference. docs.google.com/document/d/1...

“There are no friends and no enemies, only teachers.” This quote from one of the talks stuck with me the most. We had a great two days at the fantastic conference @beyondtellerrand.com We are taking a lot of inspiration to #FrontKon in Prague.

At #btconf in Düsseldorf.

After 30 years of typing, I’m switching to dictation. A few takeaways: — It’s definitely faster. — Not for everything. I still type personal texts. — Higher speed, higher cognitive load. You have to think ahead. Using #WisprFlow and it's a game changer for me. #AI #Productivity

Is AI a terrible copywriter? I’m rebuilding @pagespeedone.bsky.social website with Cursor & agent skills and rating what AI can do: Frontend dev ★★★ Translator ★★★ UI design ★★☆ Copywriting ★☆☆ It produces “AI copy”. I keep rewriting. Is it the tools, or my prompting? What works for you?

Heading to Düsseldorf next week for @beyondtellerrand.com. Looking forward to recharge! Let’s grab a coffee (or an Altbier) and talk #WebPerf, #ProductDesign & #Frontend. beyondtellerrand.com/events/dusse... #beyondtellerrand #btconf

This year's #FrontKon conference is shaping up to be a big one: – Sara Polak (AI from a strategic and philosophical perspective) – @tej.as (AI & future of frontend development) – @matuzo.at (accessibility in React) See you in Prague on October 6th? 🇨🇿 #WebDev #Frontend #Prague www.frontkon.tech

My current dev setup (mostly UI): — #Cursor, Agent mode. Haven't seen the IDE since v3. — 2–3 agents working simultaneously on one task. — Dictating prompts via Whisper Flow. What’s next? I’m starting to take this setup outside of dev. I need to figure out orchestration. Reading tips?

The success of product companies will depend on developers letting PMs, designers, and CEOs into the codebase. It’s no longer a technical barrier—just a matter of better processes and automated guardrails. It's time to open the gates. #PM #Engineering #AI

The new #Cursor UI prioritizes #AI agents, the browser, and the terminal over the code itself. It’s clearly the right move. #WebDev is becoming more about managing the flow than staring at lines of code. The code is still there, but the perspective has shifted. cursor.com/blog/cursor-...

I built a #ChromeExtension that turns #CoreWebVitals into visual overlays — right on the page. See your LCP element. Watch layout shifts happen. Spot slow interactions instantly. Other tools give you numbers. This one shows you the problem. 👉 chromewebstore.google.com/detail/core-... #WebPerf

Spring is coming to the Central Europe. For a while.

Once we thought the JavaScript ecosystem was moving fast. #AI

I’m a hands-on type of CEO. When we start something new, I do it myself first. Then, I build a process and hand it over. But with AI, this system is breaking. Processes change so fast now that building them doesn't even make sense anymore.

We talk about the speed AI coding tools give us. We don't talk enough about the hidden cost: Comprehension Debt. addyosmani.com/blog/compreh... ✍ I cover my thoughts on this in a new write-up.

#WebPerformance is trust. Once broken, it’s hard to fix. A study found that after artificial slowing, conversions dropped. The shocker? Even after speed returned to normal, "slow" users returned at much lower rates. Study: www.speedcurve.com/blog/fast/ pagespeed.one

We just baked a new release at @pagespeaches.bsky.social 1️⃣ New History page. 2️⃣ Manual tests. 3️⃣ More synthetic tests. Check the details here: pagespeed.one/en/changelog...

Programming is more than just writing code. That is why AI will not replace all programmers. A SaaS is more than just a coded app. That is why AI will not replace all SaaS businesses. A CEO is more than just an email forwarder. That is why AI will not replace all CEOs.

#WebPerf knowledge base is now global! 🌍 In PageSpeed.ONE we’ve translated ~100 in-depth articles to English. Enjoy the deep dive! ⚡️ 1️⃣ Know-how: pagespeed.one/en/know-how 2️⃣ Metrics: pagespeed.one/en/metrics 3️⃣ Blog: pagespeed.one/en/blog 4️⃣ Docs: pagespeed.one/en/documenta...

Snow & family time ❅

Developers are divided by motivation. Some like to create websites, apps… — products for people. Others like to write code. They love a specific technology. The current wave of AI greatly supports the first group and threatens the second. Where do you belong?

7 tips for your #WebPerformance education: Every December, @stoyan.me publishes the excellent Web Performance Calendar. It is a great collection of insights from the world's top experts. Even in 2026, these articles are a "must-read." Here is what caught my eye this year (thread). ⤵️

Web performance is about conversions, not just metrics. ⚡ Google measures #CoreWebVitals on real users, not machines. If your site feels slow to them, your business pays the price. #CoreWebVitals #SiteSpeed #WebPerf #SEO

The fastest Czech website, according to the PageSpeed.ONE Awards, is built by Smarty Brands. 🏆 Results: pagespeed.cz/en/awards #WebPerformance #PageSpeed

The Inconvenient Truth: How Web Performance Case Studies Undermine Our Relationship With Business, by @machal.bsky.social: https://calendar.perfplanet.com/2025/the-inconvenient-truth-how-web-performance-case-studies-undermine-our-relationship-with-business/ #performance #metrics #economics

100ms ≠ 1%, do not trust the case study from Amazon Rather have a few high-quality case studies than many low-quality ones. It hurts the whole industry. My article for #WebPerf Calendar 2025. Thanks @stoyan.me! calendar.perfplanet.com/2025/the-inc...

AI is great, but… Today I asked ChatGPT to do a simple data analysis. A year ago, it handled it perfectly. Now? Errors, inconsistencies, crashes, lost prompts — twice it even crashed my browser tab with a memory leak. He’s a genius, but sometimes he drinks.

We can finally see in the data how hiring for junior roles has dropped since the arrival of #ChatGPT. The first chart shows demand for juniors. The second shows demand for seniors. The data is from the U.S. @economist.com What’s your experience?

#SaaS tools probably won’t die. But building your own data analysis interface inside them no longer makes sense. Just look at Toggl for example… Great app, but when it comes to working with data? Mostly inadequate. When #AI can deliver an analysis in seconds, it’s simply redundant.

Interesting: #AI vs. #ProductManagement 👇 AI generates ideas cheaply and quickly. But true reasoning is social: it emerges from debate and conflicting perspectives. Possible direction for AI? Systems that can actually disagree with each other and bring diverse views. lukew.com/ff/entry.asp...

Luke Wroblewski makes a good point: AI models aren’t stealing our content. They behave just like people — reading, watching, learning, synthesizing. lukew.com/ff/entry.asp...

Radiohead are touring Europe after 7 years. In Berlin alone, they’ll play 4 shows in a row. Tickets are sold in phases — each time you have to prove you’re not a scalper, and then it’s a lottery. Crazy. (And I didn’t get picked. 😭)

Why is it hard to predict the pace of #AI progress? Take airplanes, for example, their speed. From the Wright brothers’ plane to the first Boeing 7 series in the 1960s — half a century of huge progress. And then half a century of stagnation.

Writing text: – before AI: 1h – with AI: 15 min Meme search: – before AI: 15 min – with AI: 1h

#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

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!

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.