Introducing: Autonomous Systems report Today we’re publishing our first report of the performance experienced by visitors of Wikimedia websites, focused on the Autonomous Systems visitors are connecting from.

@slightlyoff FYI:

techblog.wikimedia.org/2019/03/27/autonomous-sy...

https://performance.wikimedia.org/asreport/

Raw TSV-data is linked there and goes back to 2019.

#browserstats #webperf #perfmatters #asreport

Precompressed HTML at the Edge: Eleventy Meets Cloudflare Workers In this post, I will show you how I integrate Brotli level 11 compression directly into my 11ty build process to squeeze every possible byte out of my blog’s HTML.

New Blog post by me! Pre-compressing HTML to Brotli 11 using the #11ty build pipeline and serving via Cloudflare pages & a Cloudflare Worker #eleventy #webperf #perfmatters #cloudflare
nooshu.com/blog/2026/02...

Ad-Supported Sites Without the Slowdown + Telescope Test Agent, Thu, Feb 12, 2026, 6:00 PM | Meetup **Talk 1: Ad-Supported Sites Without the Slowdown** How to keep your site performant when running ads. Using next.js with the ads stack, fetch and refresh timing, wrangling

Tonight @ 6PM at Cloudflare in NYC!

"Ad-Supported Sites Without the Slowdown" - Kathryn Lovell
"Telescope Test Agent" - Mike Kozicki

Registration is closed, please update your RSVP if you can't make it!

meetup.com/web-performance-ny/events/312533928/

#webperf #wpo #perfmatters #meetup

Ad-Supported Sites Without the Slowdown + Telescope Test Agent, Thu, Feb 12, 2026, 6:00 PM | Meetup **Talk 1: Ad-Supported Sites Without the Slowdown** How to keep your site performant when running ads. Using next.js with the ads stack, fetch and refresh timing, wrangling

Join us on February 12th for two talks at Cloudflare's NYC office!

Talk 1: "Ad-Supported Sites Without the Slowdown" - Kathryn Lovell
Talk 2: "Telescope Test Agent" - Mike Kozicki

RSVP: meetup.com/web-performance-ny/events/312533928/

See you there!

#webperf #wpo #perfmatters #meetup #nyc #talks

Frameworks for humans in the age of machines - Rich Harris, Thu, Jan 15, 2026, 6:00 PM | Meetup **Svelte** turns **10 this year** — an eon in web development. After so much time, and at a moment when engineers are increasingly outsourcing the work to agents, is there

Happy New Year!

Join us next Thursday, January 15, "Frameworks for humans in the age of machines" with Rich Harris - @rich-harris.dev

PLEASE update your RSVPs if you cannot attend!

RSVP: www.meetup.com/web-performa...

This is a joint event with @sveltesociety.dev NYC

#webperf #wpo #perfmatters

Frameworks for humans in the age of machines - Rich Harris, Thu, Jan 15, 2026, 6:00 PM | Meetup **Svelte** turns **10 this year** — an eon in web development. After so much time, and at a moment when engineers are increasingly outsourcing the work to agents, is there

Happy Holidays!

Join us on January 15 — "Frameworks for humans in the age of machines" with Rich Harris - @rich-harris.dev

RSVP now: www.meetup.com/web-performa...

Rich is the creator of svelte.dev and rollupjs.org

This is a joint event with @sveltesociety.dev NYC

#webperf #wpo #perfmatters

Fast by Default After 25 years building sites for global brands, I kept seeing the same pattern appear. A team ships new features, users quietly begin to struggle, and only later do the bug reports start trickling…

Fast by Default calendar.perfplanet.com/2025/fast-by...

(I thought I recognised the author! Den gave me and Dean Hume our first attempt at practicing a Velocity Conf session on an AQA meetup crowd, way back in the 2010s)

#perfmatters #sitespeed

Fast by Default After 25 years building sites for global brands, I kept seeing the same pattern appear. A team ships new features, users quietly begin to struggle, and only later do the bug reports start trickling in. Someone finally checks the metrics, panic spreads, and feature development is put on hold so the t

Fast by Default https://calendar.perfplanet.com/2025/fast-by-default/

(I thought I recognised the author! Den gave me and Dean Hume our first attempt at practicing a Velocity Conf session on an AQA meetup crowd, way back in the 2010s)

#perfmatters #sitespeed

Traffic Modeling Using Machine Learning When I explain the difference between lab (aka synthetic) and field data to people, one of the things I mention is that the lab allows for testing under repeatable, controlled conditions. Each test…

Traffic Modeling Using Machine Learning calendar.perfplanet.com/2025/traffic...

#sitepseed #perfmatters

Traffic Modeling Using Machine Learning When I explain the difference between lab (aka synthetic) and field data to people, one of the things I mention is that the lab allows for testing under repeatable, controlled conditions. Each test run offers an apples-to-apples comparison with previous tests, and results are available almost immedi

Traffic Modeling Using Machine Learning calendar.perfplanet.com/2025/traffic-modeling-us...

#sitepseed #perfmatters

Exploring Large HTML Documents On The Web Most HTML documents are relatively small, providing a starting point for other resources on the page to load. But why do some websites load several megabytes of HTML code? Usually it's not that…

Exploring Large HTML Documents On The Web calendar.perfplanet.com/2025/explori...

#sitespeed #perfmatters

Exploring Large HTML Documents On The Web Most HTML documents are relatively small, providing a starting point for other resources on the page to load. But why do some websites load several megabytes of HTML code? Usually it's not that there's a lot of content on the page, but rather that other types of resources are embedded within the do

Exploring Large HTML Documents On The Web calendar.perfplanet.com/2025/exploring-large-htm...

#sitespeed #perfmatters

Writing Jira tickets on the train with train wifi 🫠 #perfmatters

Perfmatters - The #1 Web Performance Plugin for WordPress Slow WordPress sites have higher bounce rates and fewer conversions. The perfmatters plugin was created by web performance geeks to speed up your site!

Perfmatter's Black Friday sale is live. Use code BLACKFRIDAY and save 30% off. perfmatters.io?ref=537&camp...

#wordpress #perfmatters #blackfriday

If anyone is off to Amsterdam tomorrow for Performance.now(), hopefully I see you there! #webperf #perfmatters

Web Components Can’t Save Us. (But You Can!), Thu, Nov 20, 2025, 6:00 PM | Meetup In this session, [Scott Jehl](https://scottjehl.com) will share how web components and other complementary standards can help us move beyond the performance bottlenecks of

Next event on November 20: Web Components Can’t Save Us. (But You Can!) with Scott Jehl - @scottjehl.com

RSVP now: www.meetup.com/Web-Performa...

#webperf #wpo #perfmatters

Cloudflare's proactive approach to performance benchmarks led to tangible improvements in Workers, particularly reducing cold starts and enhancing stability. Public benchmarks truly drive platform innovation! #PerfMatters 2/6

Jack Franklin speaking at Pixel Pioneers Bristol 2025 on debugging web performance

"It's just nice when a site feels nice." 🎥 Watch @jackf.io's excellent talk on debugging web performance with Chrome DevTools: www.youtube.com/watch?v=rC5I...

#ThrowbackThursday #tbthursday #webperf #perfmatters #devtools @developer.chrome.com

Shoutout to @cyrilmottier.com for surfacing this gem! Bookmark for your next performance bug. And for Android OG's, here's a bit of nostalgia

#PerfMatters 😉

Platform Engineering is not just a trend and why Terraform is not dead with Artem Lajko Did you know that the average salary for a Platform Engineer is 42.5% more than a DevOps engineer? But why is that? We sat down with Artem Lajko, CNCF Kubestronaut and Ambassador as well as Author of the book Implementing GitOps with Kubernetes. We dive into the role of a platform engineer, the common pitfalls in implementing IDPs and why Backstage and AI won't solve all your problems. And we touch upon a topic hot off the press around Terraform: Its not dead! Links we discussed Artem's LinkedIn: https://www.linkedin.com/in/lajko/ Talk slides from Cloud Land: https://lajko10-my.sharepoint.com/personal/artem_lajko_dev/_layouts/15/onedrive.aspx?id=%2Fpersonal%2Fartem%5Flajko%5Fdev%2FDocuments%2FAttachments%2Fcloud%20land%2D2025%5F%2Epdf&parent=%2Fpersonal%2Fartem%5Flajko%5Fdev%2FDocuments%2FAttachments&ga=1 State of Platform Engineering Report: https://platformengineering.org/reports/state-of-platform-engineering-vol-3 Upjet GitHub Project: https://github.com/crossplane/upjet

📣 New Podcast! "Platform Engineering is not just a trend and why Terraform is not dead with Artem Lajko" on @Spreaker #cncf #devops #dynatrace #engineering #gitops #k8s #kubernetes #perfmatters #platform #terraform

Platform Democracy NOW! How to keep your Platform Promise with Daniel Bryant More than 50% of platform engineering leads don't know how to measure the impact of their platform! Many platform projects fall into common anti-pattern traps that make the platform look great on Day 1 but fail to scale and excite on Day 2! Daniel Bryant - who's profile tagline is "Helping you build better platforms" - is sharing his thoughts on how to measure the value of your platform, how to avoid common anti-patterns and why he believes that the future of platform engineering is in Platform Democracy! And of course, we wrap everything up with a discussion around the impact of Agentic AI towards platform engineering. So - tune in!   Here the links we discussed Daniel's LinkedIn Profile: https://www.linkedin.com/in/danielbryantuk/ Platform Engineering Book for Technical Product Leaders: https://www.amazon.de/Platform-Engineering-Technical-Product-Leaders/dp/1098153642/ref=asc_df_1098153642 Platform Engineering Day Talk: https://www.syntasso.io/post/syntasso-at-platengday-london-presentation-recap Kratix Website: https://www.kratix.io/ Ai-Driven Platform Engineering Blog: https://www.syntasso.io/post/what-we-learned-building-a-prototype-ai-driven-dev-interface-for-kratix Platform Democracy: https://www.syntasso.io/post/platform-democracy-rethinking-who-builds-and-consumes-your-internal-platform Platform Anti Patterns: https://www.syntasso.io/post/platform-building-antipatterns-slow-low-and-just-for-show Slide Deck on Platform Engineering for Devs and Architects: https://speakerdeck.com/danielbryantuk/platform-engineering-for-software-developers-and-architects-redux  

📣 New Podcast! "Platform Democracy NOW! How to keep your Platform Promise with Daniel Bryant" on @Spreaker #agentic #ai #antipattern #dynatrace #engineering #perfmatters #performance #platform

503 error page from the Amber alert

Apparently the Virginia state patrol website cannot handle the load from an Amber Alert.

Whole site appears to be down atm.

Someone needs a CDN...
#PERFMATTERS

Original post on fosstodon.org

Developing the twom database for Cyrus IMAP,
by Bron Gondwana at Fastmail (@fastmail).

"""
TIL: fcntl isn’t fair. Releasing the lock didn’t magically let a waiting writer proceed, the same process would often pick up the lock again without giving another process a chance. On busy files, writers […]

Original post on fosstodon.org

Woah, they've really out done themselves. The attention to detail. Perfection!

Slow as it ever was.
Slow as it, ever, was?
Slow as it, *ever* was!
Slow as it ever was...

It's got only 900 views after 2y. Let's give 'em some love!

https://www.youtube.com/watch?v=EjGWFVMKgr0

#perfmatters […]

Cutting Down Rust Compile Times With One Thousand Crates Comments

Feldera turned a 30min Rust build into 2min by breaking a monolith into tiny packages. Smart hashing makes it shine. 🚀 #rust #perfmatters #engineering www.feldera.com/blog/cutting-down-rust-c...

What are Long Animation Frames (LoAF)? Long animation frames (LoAFs) can leave your website feeling slow and unresponsive. Learn about Long Animation Frames, what they are, and how to measure them.

Bad animations kill performance. Stick to transform & opacity—they run on the GPU and won’t block frames. 🚀

More tips here:
🔗 requestmetrics.com/web-performance/long-ani...
#webperf #perfmatters

📢 Yup. That's right. I'm back with #100DaysOfPerf. I'll share more about this tomorrow, but let's have fun again. 👂🏾 🔊 🙃

#ecommerce #webperformance #sitespeed #webperf #perfmatters #corewebvitals #pagespeed

What are Long Animation Frames (LoAF)? Long animation frames (LoAFs) can leave your website feeling slow and unresponsive. Learn about Long Animation Frames, what they are, and how to measure them.

JavaScript can ruin your site’s smoothness. If it runs too long, it blocks frames and causes lag. Optimize your scripts and let the browser breathe. 🏃‍♂️
Full guide:
🔗 requestmetrics.com/web-performance/long-ani...
#webperf #perfmatters

What are Long Animation Frames (LoAF)? Long animation frames (LoAFs) can leave your website feeling slow and unresponsive. Learn about Long Animation Frames, what they are, and how to measure them.

LoAFs happen when your code hogs the main thread. Too many calculations? Rendering too much? Blocking interactions? 🚧 Fix it, and your site will feel 1000x smoother.

Full breakdown:
🔗 requestmetrics.com/web-performance/long-ani...

#perfmatters #corewebvitals