A beta version of our uptime monitoring product is available now! It's free to try right now, and we appreciate any feedback.
@mattzeunert.com
Working on web performance optimization, founder of @debugbear.com
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...
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…
debugbear.com
DebugBear product updates for July: 🍾 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.
debugbear.com
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...
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…
debugbear.com
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...
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 -…
youtube.com
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...
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...
We've just launched a new free tool: the Website Bottleneck Finder detects which resource requests hold back the FCP, LCP, and H1 rendering time! www.debugbear.com/website-bott...
Website Bottleneck Finder
Find which network resources slow down page rendering. Check if your page depends on specific scripts or data.
debugbear.com
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.
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.
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...
UK councils don't usually require homeowners to prove their need for air conditioning with dynamic thermal modelling. However, the London borough of Camden does have extensive requirements to comply with their sustainability guidelines. britishequalitylab.com/p/camdens-an...
Camden's anti-air conditioning rules are unusually strict
Some Londoners need to use dynamic thermal modelling to demonstrate the need for AC
britishequalitylab.com
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...
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...
I spent some time looking through UK planning applications to find out why councils don't allow air conditioning to be installed. britishequalitylab.com/p/why-do-uk-...
Why do UK councils refuse planning permission for air conditioning units?
Mostly due to noise
britishequalitylab.com
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.
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.
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.
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.
Is air conditioning banned in the UK? I spent some time looking into the factors that lead to it not being permitted. britishequalitylab.com/p/the-uk-doe...
The UK doesn't ban air conditioning – it doesn't permit it
The Telegraph reports that local councils are forcing homeowners to remove air conditioning units.
britishequalitylab.com
DebugBear product updates for June: ✨ Access page speed data with our MCP server 📊 More flexible histograms 🐱 View data correlations with scatter plots 🎥 Learn how to scan your website www.debugbear.com/changelog/ju...
June 2026: Custom dashboard improvements and an MCP server | DebugBear
Introducing histogram and scatter plot charts for custom dashboards, plus a new DebugBear MCP server for Claude, ChatGPT, and Cursor.
debugbear.com
Just published a new industry benchmark: how fast are different post office websites in Europe? www.debugbear.com/blog/europea...
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!
WebMCP lets websites expose tools for AI agents. @jacobandrewsky.bsky.social explains how the experimental technology works. www.debugbear.com/blog/webmcp
WebMCP: Optimize Your Website for AI Agents | DebugBear
Learn how WebMCP enables AI agents to interact with websites through structured tools instead of traditional browser automation. This guide explains how WebMCP works, how it compares to DOM-based appr...
debugbear.com
You can now create custom histograms in your DebugBear dashboards! Add additional metrics to view how they correlate.
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.
The new agentic browsing checks are now live on PageSpeed Insights! Learn more: www.debugbear.com/blog/lightho...
