Martin Michalek
@machal.bsky.social
Web performance guy (PageSpeed.cz & SpeedJar.com).
Frontendisti.cz community head.
Prague based. 🇨🇿
Supporting. 🇺🇦
Frontendisti.cz community head.
Prague based. 🇨🇿
Supporting. 🇺🇦
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?
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?
October 20, 2025 at 8:40 AM
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?
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?
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.
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.
August 25, 2025 at 6:37 AM
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.
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.
August 4, 2025 at 6:55 AM
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.
> “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.
June 2, 2025 at 7:03 AM
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.
> “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!
— @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!
May 30, 2025 at 7:01 AM
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!
— @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!
#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.)
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.)
March 21, 2025 at 11:32 AM
#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.)
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.)
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.
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.
March 20, 2025 at 7:46 AM
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.
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.
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
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
February 27, 2025 at 7:39 AM
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
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
We in the Czech Republic love these houses.
Log cabins, we say "roubenky".
OMG, I already miss it.
Log cabins, we say "roubenky".
OMG, I already miss it.
February 16, 2025 at 8:07 PM
We in the Czech Republic love these houses.
Log cabins, we say "roubenky".
OMG, I already miss it.
Log cabins, we say "roubenky".
OMG, I already miss it.
We helped Shoptet, the leading Czech e-commerce platform powering 40,000+ e-shops, improve slower interaction responses (#INP) and enhance user experience.
Thrilled to see the amazing impact of our #WebPerf work! 🎉
www.speedjar.com
Thrilled to see the amazing impact of our #WebPerf work! 🎉
www.speedjar.com
January 27, 2025 at 9:16 AM
We helped Shoptet, the leading Czech e-commerce platform powering 40,000+ e-shops, improve slower interaction responses (#INP) and enhance user experience.
Thrilled to see the amazing impact of our #WebPerf work! 🎉
www.speedjar.com
Thrilled to see the amazing impact of our #WebPerf work! 🎉
www.speedjar.com
Our Czech (and Slovak) #frontend community, #Frontendisti, is celebrating its 11th anniversary! 🎉
They say the things we do for free often bring us the greatest joy – and this community is no exception.
www.frontendisti.cz
They say the things we do for free often bring us the greatest joy – and this community is no exception.
www.frontendisti.cz
January 10, 2025 at 7:55 AM
Our Czech (and Slovak) #frontend community, #Frontendisti, is celebrating its 11th anniversary! 🎉
They say the things we do for free often bring us the greatest joy – and this community is no exception.
www.frontendisti.cz
They say the things we do for free often bring us the greatest joy – and this community is no exception.
www.frontendisti.cz
What a fantastic #WebPerf Chrome extension by @toddhgardner.com! 👏
It shows the results of #CoreWebVitals in #SERP (1), the correlation of metrics with positions (2) and also the target values of metrics you need (3).
chromewebstore.google.com/detail/keywo...
It shows the results of #CoreWebVitals in #SERP (1), the correlation of metrics with positions (2) and also the target values of metrics you need (3).
chromewebstore.google.com/detail/keywo...
December 17, 2024 at 9:35 AM
What a fantastic #WebPerf Chrome extension by @toddhgardner.com! 👏
It shows the results of #CoreWebVitals in #SERP (1), the correlation of metrics with positions (2) and also the target values of metrics you need (3).
chromewebstore.google.com/detail/keywo...
It shows the results of #CoreWebVitals in #SERP (1), the correlation of metrics with positions (2) and also the target values of metrics you need (3).
chromewebstore.google.com/detail/keywo...
We are starting to experiment with a single score that reflects all #CoreWebVitals.
Measuring #PageSpeed is complex and we are trying to bring it closer to people.
Measuring #PageSpeed is complex and we are trying to bring it closer to people.
December 6, 2024 at 10:21 AM
We are starting to experiment with a single score that reflects all #CoreWebVitals.
Measuring #PageSpeed is complex and we are trying to bring it closer to people.
Measuring #PageSpeed is complex and we are trying to bring it closer to people.
Site availability is often monitored, but do you monitor #CoreWebVitals every day?
Looking at #PageSpeedInsights once in a while isn't enough. You'll miss the pain points. You don't see the history.
Monitoring is a must-have foundation for working on #WebPerformance.
Looking at #PageSpeedInsights once in a while isn't enough. You'll miss the pain points. You don't see the history.
Monitoring is a must-have foundation for working on #WebPerformance.
December 4, 2024 at 7:50 AM
Site availability is often monitored, but do you monitor #CoreWebVitals every day?
Looking at #PageSpeedInsights once in a while isn't enough. You'll miss the pain points. You don't see the history.
Monitoring is a must-have foundation for working on #WebPerformance.
Looking at #PageSpeedInsights once in a while isn't enough. You'll miss the pain points. You don't see the history.
Monitoring is a must-have foundation for working on #WebPerformance.
#AI stuff in software is the new Clippy, the Office assistant.
The #software makers think you need them, but you don't want them.
Go away, #Clippy!
I'm looking mostly at you, @notion.com.
The #software makers think you need them, but you don't want them.
Go away, #Clippy!
I'm looking mostly at you, @notion.com.
November 30, 2024 at 10:34 AM
#AI stuff in software is the new Clippy, the Office assistant.
The #software makers think you need them, but you don't want them.
Go away, #Clippy!
I'm looking mostly at you, @notion.com.
The #software makers think you need them, but you don't want them.
Go away, #Clippy!
I'm looking mostly at you, @notion.com.
Do you ever use Google's #PageSpeedInsights to check your website speed?
Is there anything you find lacking or unsatisfactory?
Or do you use another tool for one-off tests? Why?
#WebPerf
Is there anything you find lacking or unsatisfactory?
Or do you use another tool for one-off tests? Why?
#WebPerf
November 19, 2024 at 9:20 AM
Do you ever use Google's #PageSpeedInsights to check your website speed?
Is there anything you find lacking or unsatisfactory?
Or do you use another tool for one-off tests? Why?
#WebPerf
Is there anything you find lacking or unsatisfactory?
Or do you use another tool for one-off tests? Why?
#WebPerf
Even in the news you will find evidence that the world is good place to live in.
@theonion.com are taking over InfoWars. 😅
@theonion.com are taking over InfoWars. 😅
November 15, 2024 at 11:06 AM
Even in the news you will find evidence that the world is good place to live in.
@theonion.com are taking over InfoWars. 😅
@theonion.com are taking over InfoWars. 😅
Jaký drogy berou textaři e-mailů z LinkedInu? 😅
November 14, 2024 at 12:19 PM
Jaký drogy berou textaři e-mailů z LinkedInu? 😅
Pár obrázků z vyhlašování nejrychlejšího e-shopu v ČR.
Musel jsem si dělat srandu, že už asi nejsme takoví ajťáci, když máme fyzické ceny a na fyzickém místě je dáváme fyzickým lidem. 😅
Více ke studii: pagespeed.cz/blog/nejrych...
Musel jsem si dělat srandu, že už asi nejsme takoví ajťáci, když máme fyzické ceny a na fyzickém místě je dáváme fyzickým lidem. 😅
Více ke studii: pagespeed.cz/blog/nejrych...
November 5, 2024 at 8:20 AM
Pár obrázků z vyhlašování nejrychlejšího e-shopu v ČR.
Musel jsem si dělat srandu, že už asi nejsme takoví ajťáci, když máme fyzické ceny a na fyzickém místě je dáváme fyzickým lidem. 😅
Více ke studii: pagespeed.cz/blog/nejrych...
Musel jsem si dělat srandu, že už asi nejsme takoví ajťáci, když máme fyzické ceny a na fyzickém místě je dáváme fyzickým lidem. 😅
Více ke studii: pagespeed.cz/blog/nejrych...