@mattzeunert.com
Working on web performance optimization, founder of @debugbear.com
The team behind example.com continues to rapidly iterate on their product: the previously unclosed head tag has now been closed!
View more historical data for the website here: www.debugbear.com/project/3/pa...
View more historical data for the website here: www.debugbear.com/project/3/pa...
February 12, 2026 at 11:16 AM
The team behind example.com continues to rapidly iterate on their product: the previously unclosed head tag has now been closed!
View more historical data for the website here: www.debugbear.com/project/3/pa...
View more historical data for the website here: www.debugbear.com/project/3/pa...
Something I played around with recently: an aggregated view of failing audits in a project. Would you find this kind of dashboard useful?
February 11, 2026 at 12:30 PM
Something I played around with recently: an aggregated view of failing audits in a project. Would you find this kind of dashboard useful?
Both of these websites have a 2-second LCP score – but the user experience is very different!
Learn about how to relate metrics to visitor experience on your website: www.debugbear.com/blog/web-per...
Learn about how to relate metrics to visitor experience on your website: www.debugbear.com/blog/web-per...
February 10, 2026 at 10:10 AM
Both of these websites have a 2-second LCP score – but the user experience is very different!
Learn about how to relate metrics to visitor experience on your website: www.debugbear.com/blog/web-per...
Learn about how to relate metrics to visitor experience on your website: www.debugbear.com/blog/web-per...
Why do mobile websites present more performance challenges, and what can be done to optimize them?
In this new article, @jacobandrewsky.bsky.social explains what causes poor mobile user experiences and how to fix them.
www.debugbear.com/blog/mobile-...
In this new article, @jacobandrewsky.bsky.social explains what causes poor mobile user experiences and how to fix them.
www.debugbear.com/blog/mobile-...
Mobile performance: How to make your website mobile friendly | DebugBear
Learn why websites often feel slow on mobile devices—even when they perform well on desktop. This article explains the difference between actual and perceived performance, highlights the most common m...
www.debugbear.com
February 9, 2026 at 11:24 AM
Why do mobile websites present more performance challenges, and what can be done to optimize them?
In this new article, @jacobandrewsky.bsky.social explains what causes poor mobile user experiences and how to fix them.
www.debugbear.com/blog/mobile-...
In this new article, @jacobandrewsky.bsky.social explains what causes poor mobile user experiences and how to fix them.
www.debugbear.com/blog/mobile-...
New analysis: how fast do different consent management platforms respond when clicking "Accept"?
We tested 9 different CMPs across 45 websites and ranked them by their Interaction to Next Paint score.
www.debugbear.com/blog/consent...
We tested 9 different CMPs across 45 websites and ranked them by their Interaction to Next Paint score.
www.debugbear.com/blog/consent...
February 6, 2026 at 10:10 AM
New analysis: how fast do different consent management platforms respond when clicking "Accept"?
We tested 9 different CMPs across 45 websites and ranked them by their Interaction to Next Paint score.
www.debugbear.com/blog/consent...
We tested 9 different CMPs across 45 websites and ranked them by their Interaction to Next Paint score.
www.debugbear.com/blog/consent...
🏡 Depending on the settings you use to run Lighthouse you'll get different scores!
Lighthouse tells you how fast your website would load on a slow mobile connection. But how the network is throttled varies across tools.
www.debugbear.com/blog/lightho...
Lighthouse tells you how fast your website would load on a slow mobile connection. But how the network is throttled varies across tools.
www.debugbear.com/blog/lightho...
February 5, 2026 at 1:19 PM
🏡 Depending on the settings you use to run Lighthouse you'll get different scores!
Lighthouse tells you how fast your website would load on a slow mobile connection. But how the network is throttled varies across tools.
www.debugbear.com/blog/lightho...
Lighthouse tells you how fast your website would load on a slow mobile connection. But how the network is throttled varies across tools.
www.debugbear.com/blog/lightho...
How do you get customers to find your online store?
We just published an in-depth guide on ecommerce SEO, covering everything from keyword research to site architecture and performance optimization.
Check it out here: www.debugbear.com/blog/ecommer...
We just published an in-depth guide on ecommerce SEO, covering everything from keyword research to site architecture and performance optimization.
Check it out here: www.debugbear.com/blog/ecommer...
The Complete Guide To Ecommerce SEO in 2026 | DebugBear
Learn how to optimize your ecommerce website for search engines in 2026. This guide covers keyword research, site architecture, technical SEO, Core Web Vitals, and strategies for AI-powered search.
www.debugbear.com
February 4, 2026 at 10:15 AM
How do you get customers to find your online store?
We just published an in-depth guide on ecommerce SEO, covering everything from keyword research to site architecture and performance optimization.
Check it out here: www.debugbear.com/blog/ecommer...
We just published an in-depth guide on ecommerce SEO, covering everything from keyword research to site architecture and performance optimization.
Check it out here: www.debugbear.com/blog/ecommer...
Did you know that PageSpeed Insights runs tests from one of four global test locations?
🇺🇸 Northwestern US (Oregon)
🇺🇸 Southeastern US (South Carolina)
🇳🇱 Europe (Netherlands)
🇹🇼 Asia (Taiwan)
Learn more: www.debugbear.com/blog/why-is-...
🇺🇸 Northwestern US (Oregon)
🇺🇸 Southeastern US (South Carolina)
🇳🇱 Europe (Netherlands)
🇹🇼 Asia (Taiwan)
Learn more: www.debugbear.com/blog/why-is-...
February 3, 2026 at 10:19 AM
Did you know that PageSpeed Insights runs tests from one of four global test locations?
🇺🇸 Northwestern US (Oregon)
🇺🇸 Southeastern US (South Carolina)
🇳🇱 Europe (Netherlands)
🇹🇼 Asia (Taiwan)
Learn more: www.debugbear.com/blog/why-is-...
🇺🇸 Northwestern US (Oregon)
🇺🇸 Southeastern US (South Carolina)
🇳🇱 Europe (Netherlands)
🇹🇼 Asia (Taiwan)
Learn more: www.debugbear.com/blog/why-is-...
Do we need another image format? In our new article, @aarontgrogg.com explains the advantages of JPEG XL and what tools have already adopted it.
www.debugbear.com/blog/jpeg-xl...
www.debugbear.com/blog/jpeg-xl...
What is JPEG XL and do we really need another image format? | DebugBear
Learn what JPEG XL is, how it compares to other image formats like AVIF and WebP, and whether you should use it on your website.
www.debugbear.com
February 2, 2026 at 9:57 AM
Do we need another image format? In our new article, @aarontgrogg.com explains the advantages of JPEG XL and what tools have already adopted it.
www.debugbear.com/blog/jpeg-xl...
www.debugbear.com/blog/jpeg-xl...
Recorded a new video explaining how to identify slow pages, diagnose performance issues, and set up monitoring with DebugBear!
January 30, 2026 at 8:50 AM
Recorded a new video explaining how to identify slow pages, diagnose performance issues, and set up monitoring with DebugBear!
🎥 A few months ago I talked to Henri Helvetica about performance monitoring on the SPDY steam. You can now find the recording on Youtube!
www.youtube.com/watch?v=0IWF...
www.youtube.com/watch?v=0IWF...
SPDY STREAM 018 with Matt Zeunert of DebugBear on Effective Monitoring
There's are long standing and critical rules: "you cannot improve what you do not measure, and you cannot measure what you do not monitor". Effective web performance tracking is essential. Given the…
www.youtube.com
January 29, 2026 at 10:10 AM
🎥 A few months ago I talked to Henri Helvetica about performance monitoring on the SPDY steam. You can now find the recording on Youtube!
www.youtube.com/watch?v=0IWF...
www.youtube.com/watch?v=0IWF...
⚛️ React Compiler can speed up your React app without manual memoization!
Our new article explains how React Compiler works and when to use it to improve React performance.
www.debugbear.com/blog/react-c...
Our new article explains how React Compiler works and when to use it to improve React performance.
www.debugbear.com/blog/react-c...
React Compiler: An Introduction, Pros, Cons & When to Use It | DebugBear
React Compiler helps optimize React performance by automatically memoizing your app, which can improve your Interaction to Next Paint (INP) scores, eliminate unnecessary re-renders, and make your…
www.debugbear.com
January 28, 2026 at 10:10 AM
⚛️ React Compiler can speed up your React app without manual memoization!
Our new article explains how React Compiler works and when to use it to improve React performance.
www.debugbear.com/blog/react-c...
Our new article explains how React Compiler works and when to use it to improve React performance.
www.debugbear.com/blog/react-c...
Why would a browser pause rendering page content once it's already started?
Scripts in the HTML head block all rendering. But scripts in the body just block page content below it. In the screenshot you can see those resources marked as parser-blocking.
www.debugbear.com/blog/visuali...
Scripts in the HTML head block all rendering. But scripts in the body just block page content below it. In the screenshot you can see those resources marked as parser-blocking.
www.debugbear.com/blog/visuali...
January 27, 2026 at 10:10 AM
Why would a browser pause rendering page content once it's already started?
Scripts in the HTML head block all rendering. But scripts in the body just block page content below it. In the screenshot you can see those resources marked as parser-blocking.
www.debugbear.com/blog/visuali...
Scripts in the HTML head block all rendering. But scripts in the body just block page content below it. In the screenshot you can see those resources marked as parser-blocking.
www.debugbear.com/blog/visuali...
How does speed impact how visitors experience your website? And how can metrics hide real-world problems visitors face?
My new article explains the impact of performance on user experience and behavior + how to interpret metrics in context.
www.debugbear.com/blog/web-per...
My new article explains the impact of performance on user experience and behavior + how to interpret metrics in context.
www.debugbear.com/blog/web-per...
How Web Performance Impacts User Experience | DebugBear
Learn how website speed impacts user experience and how you can measure performance and business outcomes.
www.debugbear.com
January 26, 2026 at 10:10 AM
How does speed impact how visitors experience your website? And how can metrics hide real-world problems visitors face?
My new article explains the impact of performance on user experience and behavior + how to interpret metrics in context.
www.debugbear.com/blog/web-per...
My new article explains the impact of performance on user experience and behavior + how to interpret metrics in context.
www.debugbear.com/blog/web-per...
The useMemo and useCallback are key to preventing unnecessary render work in React. Our new article explains how to use them effectively to speed up React performance.
www.debugbear.com/blog/react-u...
www.debugbear.com/blog/react-u...
Improve React Performance With useMemo And useCallback | DebugBear
Learn how to optimize React application performance using useMemo and useCallback. This article explains when memoization truly matters, highlights common performance pitfalls, and provides practical…
www.debugbear.com
January 23, 2026 at 10:10 AM
The useMemo and useCallback are key to preventing unnecessary render work in React. Our new article explains how to use them effectively to speed up React performance.
www.debugbear.com/blog/react-u...
www.debugbear.com/blog/react-u...
Just added Aaron T. Grogg to our list of consulting partners!
Reach out to him if you need help making your website fast or leveling up the performance skills of your team.
www.debugbear.com/web-performa...
Reach out to him if you need help making your website fast or leveling up the performance skills of your team.
www.debugbear.com/web-performa...
January 22, 2026 at 10:02 AM
Just added Aaron T. Grogg to our list of consulting partners!
Reach out to him if you need help making your website fast or leveling up the performance skills of your team.
www.debugbear.com/web-performa...
Reach out to him if you need help making your website fast or leveling up the performance skills of your team.
www.debugbear.com/web-performa...
One of the most common questions people ask me: why am I getting different Lighthouse scores locally, on PageSpeed Insights, and on DebugBear?
The most common reasons: differences in network throttling, different CPU power, and different test locations.
www.debugbear.com/blog/lightho...
The most common reasons: differences in network throttling, different CPU power, and different test locations.
www.debugbear.com/blog/lightho...
How To Diagnose Lighthouse Score Discrepancies Between Tools | DebugBear
Learn why Lighthouse scores differ between tools like PageSpeed Insights and Chrome DevTools, and how to diagnose and fix these discrepancies.
www.debugbear.com
January 21, 2026 at 10:22 AM
One of the most common questions people ask me: why am I getting different Lighthouse scores locally, on PageSpeed Insights, and on DebugBear?
The most common reasons: differences in network throttling, different CPU power, and different test locations.
www.debugbear.com/blog/lightho...
The most common reasons: differences in network throttling, different CPU power, and different test locations.
www.debugbear.com/blog/lightho...
The CrUX Trends dashboard on DebugBear now lets you compare both domains and specific URLs on your website!
www.debugbear.com/docs/crux-tr...
www.debugbear.com/docs/crux-tr...
January 16, 2026 at 2:44 PM
The CrUX Trends dashboard on DebugBear now lets you compare both domains and specific URLs on your website!
www.debugbear.com/docs/crux-tr...
www.debugbear.com/docs/crux-tr...
The image on this website could be a 10th of the size if it used a more appropriate format!
The main image is served as a lossless PNG file. But it's a photo so a lossy format like JPEG would be better. Or use a modern format like WebP or AVIF!
Learn more: www.debugbear.com/blog/image-f...
The main image is served as a lossless PNG file. But it's a photo so a lossy format like JPEG would be better. Or use a modern format like WebP or AVIF!
Learn more: www.debugbear.com/blog/image-f...
January 15, 2026 at 10:42 AM
The image on this website could be a 10th of the size if it used a more appropriate format!
The main image is served as a lossless PNG file. But it's a photo so a lossy format like JPEG would be better. Or use a modern format like WebP or AVIF!
Learn more: www.debugbear.com/blog/image-f...
The main image is served as a lossless PNG file. But it's a photo so a lossy format like JPEG would be better. Or use a modern format like WebP or AVIF!
Learn more: www.debugbear.com/blog/image-f...
Why can CDNs improve web performance even when they have to fetch response data from the origin server?
My new video explains how Content Delivery Networks work and answers this question and others!
www.youtube.com/watch?v=7pYE...
My new video explains how Content Delivery Networks work and answers this question and others!
www.youtube.com/watch?v=7pYE...
Content Delivery Networks (CDNs): latency reduction, caching, and more
Learn how Content Delivery Networks work and how they can improve website performance.
Global CDN test: https://www.debugbear.com/test/ttfb?utm_campaign=yt-cdn
00:00 What is a Content Delivery…
www.youtube.com
January 14, 2026 at 10:10 AM
Why can CDNs improve web performance even when they have to fetch response data from the origin server?
My new video explains how Content Delivery Networks work and answers this question and others!
www.youtube.com/watch?v=7pYE...
My new video explains how Content Delivery Networks work and answers this question and others!
www.youtube.com/watch?v=7pYE...
The Largest Contentful Paint alerts on DebugBear now tell you whether the LCP element has changed and what subparts regressed.
January 13, 2026 at 10:10 AM
The Largest Contentful Paint alerts on DebugBear now tell you whether the LCP element has changed and what subparts regressed.
Single-page React applications often struggle with performance. We just published an in-depth guide on how to diagnose React performance issues and what you can do to fix them!
www.debugbear.com/blog/measuri...
www.debugbear.com/blog/measuri...
How to Measure and Optimize React Performance | DebugBear
Learn how to measure the performance of your React app and identify what's slowing it down.
www.debugbear.com
January 12, 2026 at 10:53 AM
Single-page React applications often struggle with performance. We just published an in-depth guide on how to diagnose React performance issues and what you can do to fix them!
www.debugbear.com/blog/measuri...
www.debugbear.com/blog/measuri...
What is the critical rendering path of your website, and how do you optimize it?
My new video explains how browsers load key resources needed to display page content and how to use the Lighthouse network dependency tree to analyze request chains.
www.youtube.com/watch?v=Yf4i...
My new video explains how browsers load key resources needed to display page content and how to use the Lighthouse network dependency tree to analyze request chains.
www.youtube.com/watch?v=Yf4i...
Analyze the critical rendering path with the network dependency tree
YouTube video by DebugBear
www.youtube.com
January 8, 2026 at 11:33 AM
What is the critical rendering path of your website, and how do you optimize it?
My new video explains how browsers load key resources needed to display page content and how to use the Lighthouse network dependency tree to analyze request chains.
www.youtube.com/watch?v=Yf4i...
My new video explains how browsers load key resources needed to display page content and how to use the Lighthouse network dependency tree to analyze request chains.
www.youtube.com/watch?v=Yf4i...
We've improved the request initiator snippets we collect, as well as formatting them more nicely!
Give it try with our free website speed testing tool: debugbear.com/test
Give it try with our free website speed testing tool: debugbear.com/test
January 6, 2026 at 10:10 AM
We've improved the request initiator snippets we collect, as well as formatting them more nicely!
Give it try with our free website speed testing tool: debugbear.com/test
Give it try with our free website speed testing tool: debugbear.com/test
Wrote a bit more about the memory leak we fixed recently, and why we ignored it for 6 years.
Thanks to @nucliweb.net for sharing some of his questions!
www.debugbear.com/blog/javascr...
Thanks to @nucliweb.net for sharing some of his questions!
www.debugbear.com/blog/javascr...
We Fixed A 6-Year-Old JavaScript Memory Leak | DebugBear
How we discovered and fixed a lodash memoize memory leak that caused out of memory crashes in our Google Cloud Functions.
www.debugbear.com
January 5, 2026 at 1:10 PM
Wrote a bit more about the memory leak we fixed recently, and why we ignored it for 6 years.
Thanks to @nucliweb.net for sharing some of his questions!
www.debugbear.com/blog/javascr...
Thanks to @nucliweb.net for sharing some of his questions!
www.debugbear.com/blog/javascr...