iiinova — where your digital self keeps evolving

mattzeunert.com @mattzeunert.com · 29/09/2026

Want to know what features are supported in your visitors' browsers? DebugBear now reports browser version adoption over time and shows you browser support based on Google's Baseline project.

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mattzeunert.com @mattzeunert.com · 28/09/2026

New in DebugBear custom dashboards: show rating thresholds for each metric, and customize your data aggregation interval.

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mattzeunert.com @mattzeunert.com · 25/09/2026

More progress on speeding up VM launches, this time by switching to a faster disk type!

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mattzeunert.com @mattzeunert.com · 18/09/2026

We finally did some more work to bring down the launch time of the VMs that run our page speed tests! VMs now start 30% faster after embedding more data in the disk image rather than loading it from artifact registry.

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mattzeunert.com @mattzeunert.com · 15/09/2026

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...

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mattzeunert.com @mattzeunert.com · 03/09/2026

Interesting AI overview 💦⚽️

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mattzeunert.com @mattzeunert.com · 28/08/2026

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!

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mattzeunert.com @mattzeunert.com · 24/08/2026

Coming soon in DebugBear: track Core Web Vitals for individual soft navigations in single-page apps.

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mattzeunert.com @mattzeunert.com · 22/08/2026

Claude is great for making papers more readable. The aversion some academics have to paragraphs is bizarre.

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mattzeunert.com @mattzeunert.com · 17/08/2026

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

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mattzeunert.com @mattzeunert.com · 14/08/2026

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.

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mattzeunert.com @mattzeunert.com · 13/08/2026

DebugBear now also sends out notifications when one of your web performance budgets recovers.

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mattzeunert.com @mattzeunert.com · 12/08/2026

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.

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mattzeunert.com @mattzeunert.com · 04/08/2026

A beta version of our uptime monitoring product is available now! It's free to try right now, and we appreciate any feedback.

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mattzeunert.com @mattzeunert.com · 30/07/2026

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 🙃

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mattzeunert.com @mattzeunert.com · 27/07/2026

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...

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mattzeunert.com @mattzeunert.com · 24/07/2026

We've made some improvements to our Website Bottleneck Finder! Thanks for all the feedback 🥰 🔬 Actionable advice 🤔 More context on how the bottleneck finder is different from our page speed test 😵 Fewer crashes Try it yourself here: www.debugbear.com/website-bott...

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mattzeunert.com @mattzeunert.com · 16/07/2026

The Ministry of Housing has confirmed that developers can add air conditioning to homes that already meet the passive cooling requirements! AC could still be impracticable due to the "all possible passive means" standard, sustainability requirements, or local planning rules.

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mattzeunert.com @mattzeunert.com · 15/07/2026

We've improved the comparison view for breakdown bars in DebugBear! Instead of just showing data side by side you now get an actual comparison.

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mattzeunert.com @mattzeunert.com · 13/07/2026

Parser-blocking scripts block rendering of any content below them in the HTML. If they are placed at the end of the body then that's not a problem, but if they appear further up they can slow down your website. Learn more: www.debugbear.com/blog/visuali...

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mattzeunert.com @mattzeunert.com · 09/07/2026

These almost look like real enterprise enquiries, except for the example.net email address...

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mattzeunert.com @mattzeunert.com · 06/07/2026

Largest Contentful Paint delays in single page apps often show up as load delay. Until the JavaScript code has run, the browser simply doesn't know about the image file that it needs to load. Learn more about load delay here: www.debugbear.com/blog/lcp-res...

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mattzeunert.com @mattzeunert.com · 05/07/2026

Still confused by the new build AC ban. My naive read of Part O does not sound like a ban. Though it also interacts with Part L (reducing power use). But then the Part O impact assessment states avoiding AC uptake as a goal, not just passive cooling assets.publishing.service.gov.uk/media/61b883...

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mattzeunert.com @mattzeunert.com · 01/07/2026

Cannabis isn't banned in the UK! You just need to demonstrate need and show that you've exhausted all preferable steps of the treatment hierarchy.

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mattzeunert.com @mattzeunert.com · 30/06/2026

Our website traffic has been pretty stable over the last two years, but Ahrefs estimates we 10x'd it! I think it's a mix of spam in their data and some high-volume keywords where we rank but don't get many clicks.

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mattzeunert.com @mattzeunert.com · 29/06/2026

I finally managed to find an example where an air conditioning unit was actually removed at least partially for climate reasons! On appeal, the refusal based on local character, noise, and Camden's climate change resilience policy was upheld.

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mattzeunert.com @mattzeunert.com · 29/06/2026

Councils rarely refuse permission to install AC because of the cooling hierarchy. Normally it's due to noise or appearance. Camden Council did order the removal of three heat pumps, despite extensive prior work. On appeal, planning permission was granted.

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mattzeunert.com @mattzeunert.com · 25/06/2026

Just published a new industry benchmark: how fast are different post office websites in Europe? www.debugbear.com/blog/europea...

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mattzeunert.com @mattzeunert.com · 24/06/2026

Are some government websites just slow because visitors have slower websites? To answer that question, we added support for scatter chart to our DebugBear performance dashboards!

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mattzeunert.com @mattzeunert.com · 22/06/2026

You can now create custom histograms in your DebugBear dashboards! Add additional metrics to view how they correlate.

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mattzeunert.com @mattzeunert.com · 19/06/2026

I'm speaking at Pixel Pioneers today! I'll explain different ways to measure web performance. Found a new fun example this week where Lighthouse reports that a slow connection makes the website load much faster compared to the measured data.

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mattzeunert.com @mattzeunert.com · 17/06/2026

The new agentic browsing checks are now live on PageSpeed Insights! Learn more: www.debugbear.com/blog/lightho...

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mattzeunert.com @mattzeunert.com · 17/06/2026

Pretty excited for our upcoming histogram upgrade!

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mattzeunert.com @mattzeunert.com · 15/06/2026

New analysis: what country has the fastest train booking website? Interesting findings: 🚛 A site can load quickly even with large assets 👉 Many fast-loading sites respond slowly to interactions www.debugbear.com/blog/which-e...

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mattzeunert.com @mattzeunert.com · 12/06/2026

Another update to example.com this week: the HTML now defines an empty icon. This means browsers no longer try to load favicon.ico, significantly reducing overall page weight. www.debugbear.com/project/3/pa...

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mattzeunert.com @mattzeunert.com · 03/06/2026

Want to analyze your web performance data via chat or configure website monitoring with your AI agent? We've added support for an MCP server that you can connect to ChatGPT, Claude, and other tools.

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mattzeunert.com @mattzeunert.com · 30/05/2026

Good thing I still review the code Claude writes 😬

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mattzeunert.com @mattzeunert.com · 27/05/2026

Need help optimizing your Shopify website? I just added Hallway to our partner listing. They can help you improve page speed and overall website performance. www.debugbear.com/web-performa...

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mattzeunert.com @mattzeunert.com · 25/05/2026

Want to run a one-off page speed test without setting up monitoring? The new DebugBear quick tests feature makes it easy to run performance tests without having the pages clutter your monitoring dashboard.

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mattzeunert.com @mattzeunert.com · 23/05/2026

I think Claude is dwelling on the problem for a bit too long here...

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mattzeunert.com @mattzeunert.com · 22/05/2026

Our website scan at DebugBear makes it easy to set up web performance monitoring for your website. But it's usually not worth it to test many thousands of individual pages regularly. We've just shipped a new auto-select option that tries to pick a diverse set of templates!

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mattzeunert.com @mattzeunert.com · 21/05/2026

Got some helpful feedback on the website grader from @massimovilla.bsky.social yesterday: the non-performance data is a bit hard to find! I've fixed that now: you can see the AI score and other Lighthouse scores right in the overview tab. www.debugbear.com/test/website...

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mattzeunert.com @mattzeunert.com · 20/05/2026

Server-side rendering means page content doesn't depend on loading and running client-side JavaScript. But sometimes images are still not loaded right away. You can test your own website here to see how the main image on your website is loaded: www.debugbear.com/test/website...

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mattzeunert.com @mattzeunert.com · 15/05/2026

💖 Started adding AI agent prompts to some of the DebugBear performance recommendations. Just paste these into the AI coding agent you use so it can fix the issue for you.

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mattzeunert.com @mattzeunert.com · 14/05/2026

Make sure to only preload fonts that are actually needed on your website! Preloading fonts can improve page speed and reduce layout shift. However, they it can also take bandwidth away from critical resources. Learn more: www.debugbear.com/blog/preload...

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mattzeunert.com @mattzeunert.com · 13/05/2026

We've released the new DebugBear RUM alert landing pages! You can now easily see what budget triggered the alert, how often that budget was breached recently, and review what changes impacted your metrics!

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mattzeunert.com @mattzeunert.com · 12/05/2026

The audits from the new agentic browsing category in Lighthouse are now available in DebugBear's project-wide audit view! Here's an example: www.debugbear.com/project/2597...

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mattzeunert.com @mattzeunert.com · 11/05/2026

DebugBear not lets you fully customize the viewport size for lab tests!

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mattzeunert.com @mattzeunert.com · 10/05/2026

✨ There's a new audit category in Lighthouse 13.3: Agentic Browsing! It validates proposed standards like WebMCP and LLMs.txt, as well as checking the page accessibility tree and its visual stability. I explored the Agentic Browsing category in more detail here: www.debugbear.com/blog/lightho...

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mattzeunert.com @mattzeunert.com · 07/05/2026

Working on some tweaks to the DebugBear RUM alert landing pages! Hoping to make it clearer why an alert was triggered and what to do about it.

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