@mattzeunert.com
Working on web performance optimization, founder of @debugbear.com
Google has launched a new set of ad performance metrics! Our latest article takes a deeper look at how this data is collected and what you can do with it.
www.debugbear.com/blog/chrome-...
www.debugbear.com/blog/chrome-...
New Data From Google: See How Ads Impact Web Performance | DebugBear
Google has been working on new metrics to measure how ads impact performance. Learn how you can view this data for real visitors and how to check it yourself in Chrome DevTools.
www.debugbear.com
September 16, 2026 at 9:10 AM
Google has launched a new set of ad performance metrics! Our latest article takes a deeper look at how this data is collected and what you can do with it.
www.debugbear.com/blog/chrome-...
www.debugbear.com/blog/chrome-...
Google has started publishing ad performance data as part of the Chrome User Experience Report!
Where available, you can now find this data in the Web Vitals tab of our free website speed test. Try it yourself here: www.debugbear.com/test/website...
Where available, you can now find this data in the Web Vitals tab of our free website speed test. Try it yourself here: www.debugbear.com/test/website...
September 15, 2026 at 7:58 PM
Google has started publishing ad performance data as part of the Chrome User Experience Report!
Where available, you can now find this data in the Web Vitals tab of our free website speed test. Try it yourself here: www.debugbear.com/test/website...
Where available, you can now find this data in the Web Vitals tab of our free website speed test. Try it yourself here: www.debugbear.com/test/website...
Interesting AI overview 💦⚽️
September 3, 2026 at 10:13 AM
Interesting AI overview 💦⚽️
Marketing and development teams often work on web performance problems together.
In this guide I explain how different teams can collaborate effectively and get the web performance data they need.
www.debugbear.com/blog/marketi...
In this guide I explain how different teams can collaborate effectively and get the web performance data they need.
www.debugbear.com/blog/marketi...
How Marketing And Development Teams Can Collaborate On Page Speed | DebugBear
Marketing owns the site experience but developers make the changes. Learn how both teams can use shared performance data, experiments, and alerts to work together on page speed.
www.debugbear.com
September 2, 2026 at 1:14 PM
Marketing and development teams often work on web performance problems together.
In this guide I explain how different teams can collaborate effectively and get the web performance data they need.
www.debugbear.com/blog/marketi...
In this guide I explain how different teams can collaborate effectively and get the web performance data they need.
www.debugbear.com/blog/marketi...
My Pixel Pioneers talk is on Youtube now!
I give a brief introduction to page speed and then dive into different network throttling methods in Lighthouse, DevTools, and other tools.
www.youtube.com/watch?v=KO02...
I give a brief introduction to page speed and then dive into different network throttling methods in Lighthouse, DevTools, and other tools.
www.youtube.com/watch?v=KO02...
Where Do Your Web Performance Metrics Come From? - Matt Zeunert - Pixel Pioneers 2026
YouTube video by Pixel Pioneers
www.youtube.com
August 31, 2026 at 9:53 AM
My Pixel Pioneers talk is on Youtube now!
I give a brief introduction to page speed and then dive into different network throttling methods in Lighthouse, DevTools, and other tools.
www.youtube.com/watch?v=KO02...
I give a brief introduction to page speed and then dive into different network throttling methods in Lighthouse, DevTools, and other tools.
www.youtube.com/watch?v=KO02...
Spent some time looking at carbon emission calculations for two proposed new data centers.
britishequalitylab.com/p/what-are-t...
britishequalitylab.com/p/what-are-t...
What are The Guardian and Foxglove saying about two proposed new data centres?
How does the emissions calculation work?
britishequalitylab.com
August 30, 2026 at 12:49 PM
Spent some time looking at carbon emission calculations for two proposed new data centers.
britishequalitylab.com/p/what-are-t...
britishequalitylab.com/p/what-are-t...
We're working on updating our weekly report! It will include data across synthetic tests, CrUX, RUM, and uptime checks.
Plus you'll be able to receive it in Slack and Teams, rather than just over email!
Plus you'll be able to receive it in Slack and Teams, rather than just over email!
August 28, 2026 at 2:13 PM
We're working on updating our weekly report! It will include data across synthetic tests, CrUX, RUM, and uptime checks.
Plus you'll be able to receive it in Slack and Teams, rather than just over email!
Plus you'll be able to receive it in Slack and Teams, rather than just over email!
Our RUM product now lets you track each soft navigation in a single page app as it's own page view!
This way you can get Core Web Vitals metrics that match how your users actually experience navigating around your app.
www.debugbear.com/docs/rum/spa...
This way you can get Core Web Vitals metrics that match how your users actually experience navigating around your app.
www.debugbear.com/docs/rum/spa...
Single Page App (SPA) Monitoring | DebugBear
Learn how DebugBear tracks client-side navigations in single page applications and how to report each soft navigation as its own page view.
www.debugbear.com
August 27, 2026 at 2:14 PM
Our RUM product now lets you track each soft navigation in a single page app as it's own page view!
This way you can get Core Web Vitals metrics that match how your users actually experience navigating around your app.
www.debugbear.com/docs/rum/spa...
This way you can get Core Web Vitals metrics that match how your users actually experience navigating around your app.
www.debugbear.com/docs/rum/spa...
New in Debugear this month:
✅ Uptime monitoring
🤖 Server timing support
🤑 URL-based conversion triggers
www.debugbear.com/changelog/au...
✅ Uptime monitoring
🤖 Server timing support
🤑 URL-based conversion triggers
www.debugbear.com/changelog/au...
August 2026: Uptime monitoring and Server Timing support | DebugBear
Introducing Uptime Monitoring to track site availability, Server Timing support for lab tests and RUM, URL-based conversion triggers, and more customization options.
www.debugbear.com
August 26, 2026 at 10:51 AM
New in Debugear this month:
✅ Uptime monitoring
🤖 Server timing support
🤑 URL-based conversion triggers
www.debugbear.com/changelog/au...
✅ Uptime monitoring
🤖 Server timing support
🤑 URL-based conversion triggers
www.debugbear.com/changelog/au...
Coming soon in DebugBear: track Core Web Vitals for individual soft navigations in single-page apps.
August 24, 2026 at 9:03 AM
Coming soon in DebugBear: track Core Web Vitals for individual soft navigations in single-page apps.
Claude is great for making papers more readable. The aversion some academics have to paragraphs is bizarre.
August 22, 2026 at 11:49 AM
Claude is great for making papers more readable. The aversion some academics have to paragraphs is bizarre.
I got distracted and ended up needing over 5 weeks to finish my latest article on UK air conditioning rules 😔
But I'm finally done taking a closer look at the stories in The Telegraph and some of the broader media coverage.
britishequalitylab.com/p/a-review-o...
But I'm finally done taking a closer look at the stories in The Telegraph and some of the broader media coverage.
britishequalitylab.com/p/a-review-o...
A review of media reporting on air conditioning planning rules in Camden
The specific stories are true, but it's hard to draw broad conclusions
britishequalitylab.com
August 21, 2026 at 9:10 AM
I got distracted and ended up needing over 5 weeks to finish my latest article on UK air conditioning rules 😔
But I'm finally done taking a closer look at the stories in The Telegraph and some of the broader media coverage.
britishequalitylab.com/p/a-review-o...
But I'm finally done taking a closer look at the stories in The Telegraph and some of the broader media coverage.
britishequalitylab.com/p/a-review-o...
Server timing headers make backend performance metrics available on the front-end.
Our latest article explains how these headers work and how to view them in DevTools and DebugBear.
www.debugbear.com/blog/server-...
Our latest article explains how these headers work and how to view them in DevTools and DebugBear.
www.debugbear.com/blog/server-...
Server Timing: Measure And Track Backend Performance | DebugBear
Learn what the Server-Timing header is and how to track server-side performance metrics.
www.debugbear.com
August 20, 2026 at 11:54 AM
Server timing headers make backend performance metrics available on the front-end.
Our latest article explains how these headers work and how to view them in DevTools and DebugBear.
www.debugbear.com/blog/server-...
Our latest article explains how these headers work and how to view them in DevTools and DebugBear.
www.debugbear.com/blog/server-...
We've improved support for server timing headers in DebugBear!
📊 Breakdown view in request details
⚙️ Automatic server timing tracking in synthetic monitoring
📈 Track server timings as a custom RUM metric
📊 Breakdown view in request details
⚙️ Automatic server timing tracking in synthetic monitoring
📈 Track server timings as a custom RUM metric
August 17, 2026 at 1:41 PM
We've improved support for server timing headers in DebugBear!
📊 Breakdown view in request details
⚙️ Automatic server timing tracking in synthetic monitoring
📈 Track server timings as a custom RUM metric
📊 Breakdown view in request details
⚙️ Automatic server timing tracking in synthetic monitoring
📈 Track server timings as a custom RUM metric
I made a flowerpot from the soil in my friend's garden! Wasn't sure it's possible, but ChatGPT was incredibly helpful throughout the process.
August 14, 2026 at 10:38 AM
I made a flowerpot from the soil in my friend's garden! Wasn't sure it's possible, but ChatGPT was incredibly helpful throughout the process.
DebugBear now also sends out notifications when one of your web performance budgets recovers.
August 13, 2026 at 9:10 AM
DebugBear now also sends out notifications when one of your web performance budgets recovers.
We now show Core Web Vitals metrics for specific soft navigations in your RUM data!
Note that this is currently only supported in the latest version of Chrome.
Note that this is currently only supported in the latest version of Chrome.
August 12, 2026 at 9:10 AM
We now show Core Web Vitals metrics for specific soft navigations in your RUM data!
Note that this is currently only supported in the latest version of Chrome.
Note that this is currently only supported in the latest version of Chrome.
A beta version of our uptime monitoring product is available now!
It's free to try right now, and we appreciate any feedback.
It's free to try right now, and we appreciate any feedback.
August 4, 2026 at 12:27 PM
A beta version of our uptime monitoring product is available now!
It's free to try right now, and we appreciate any feedback.
It's free to try right now, and we appreciate any feedback.
What if the browser could report performance issues like it does security issues?
The Network Efficiency Guardrails API is a proposed web platform feature that detects page speed issues in the browser and sends a report to the server.
www.debugbear.com/blog/network...
The Network Efficiency Guardrails API is a proposed web platform feature that detects page speed issues in the browser and sends a report to the server.
www.debugbear.com/blog/network...
Network Efficiency Guardrails: Detect Web Performance Issues | DebugBear
Learn how to detect hidden network performance problems before they impact your users. This guide explains Microsoft's new Network Efficiency Guardrails, how they use Document Policy and the…
www.debugbear.com
August 3, 2026 at 11:42 AM
What if the browser could report performance issues like it does security issues?
The Network Efficiency Guardrails API is a proposed web platform feature that detects page speed issues in the browser and sends a report to the server.
www.debugbear.com/blog/network...
The Network Efficiency Guardrails API is a proposed web platform feature that detects page speed issues in the browser and sends a report to the server.
www.debugbear.com/blog/network...
DebugBear product updates for July:
🍾 New free bottleneck finder
💽 Better data export
🤔 Improved comparison view
🌎 Bulk update test regions
www.debugbear.com/changelog/ju...
🍾 New free bottleneck finder
💽 Better data export
🤔 Improved comparison view
🌎 Bulk update test regions
www.debugbear.com/changelog/ju...
July 2026: New bottleneck finder tool and better data export | DebugBear
Introducing our new bottleneck finder tool, individual chart exports for custom dashboards, improved comparison data, bulk region editing, and HAR waterfall exports.
www.debugbear.com
July 30, 2026 at 2:06 PM
DebugBear product updates for July:
🍾 New free bottleneck finder
💽 Better data export
🤔 Improved comparison view
🌎 Bulk update test regions
www.debugbear.com/changelog/ju...
🍾 New free bottleneck finder
💽 Better data export
🤔 Improved comparison view
🌎 Bulk update test regions
www.debugbear.com/changelog/ju...
Starting to add uptime monitoring to DebugBear! Already detected a short outage on web.dev, and brought down our uptime monitoring infrastructure for three hours 🙃
July 30, 2026 at 9:08 AM
Starting to add uptime monitoring to DebugBear! Already detected a short outage on web.dev, and brought down our uptime monitoring infrastructure for three hours 🙃
New article explaining how our bottleneck finder can detect render-blocking requests that Chrome doesn't report!
Learn how we built our latest free tool.
www.debugbear.com/blog/website...
Learn how we built our latest free tool.
www.debugbear.com/blog/website...
Find Hidden Render-Blocking Requests with the Website Bottleneck Finder | DebugBear
Chrome's render-blocking label doesn't always fully illustrate which resources are impacting a page's First Contentful Paint (FCP), Largest Contentful Paint (LCP) or H1-visible metrics. We recently…
www.debugbear.com
July 29, 2026 at 12:37 PM
New article explaining how our bottleneck finder can detect render-blocking requests that Chrome doesn't report!
Learn how we built our latest free tool.
www.debugbear.com/blog/website...
Learn how we built our latest free tool.
www.debugbear.com/blog/website...
We've published a new video explaining how to get started with the DebugBear MCP server and how it can help you analyze web performance issues and set up monitoring.
www.youtube.com/watch?v=V8sw...
www.youtube.com/watch?v=V8sw...
How to setup and use the DebugBear MCP Server
In this video, we will take a look at how to setup the DebugBear MCP Server with Claude.
DebugBear MCP server guide: https://www.debugbear.com/docs/mcp
0:00 - Intro
0:38 - Setup with Claude
1:30 -…
www.youtube.com
July 28, 2026 at 3:13 PM
We've published a new video explaining how to get started with the DebugBear MCP server and how it can help you analyze web performance issues and set up monitoring.
www.youtube.com/watch?v=V8sw...
www.youtube.com/watch?v=V8sw...
Spotted a recent performance regression on the Squarespace homepage recently: the H1 and main image now depend on a script to show up.
DebugBear reports the regression right away, and you can start seeing the impact on Google's CrUX metrics as well now.
www.debugbear.com/project/2597...
DebugBear reports the regression right away, and you can start seeing the impact on Google's CrUX metrics as well now.
www.debugbear.com/project/2597...
July 27, 2026 at 11:03 AM
Spotted a recent performance regression on the Squarespace homepage recently: the H1 and main image now depend on a script to show up.
DebugBear reports the regression right away, and you can start seeing the impact on Google's CrUX metrics as well now.
www.debugbear.com/project/2597...
DebugBear reports the regression right away, and you can start seeing the impact on Google's CrUX metrics as well now.
www.debugbear.com/project/2597...