We have a new #1 Link 🚊 ridership day! On Friday, June 19, Link light rail saw about 280,000 riders, amid the USA 🇺🇸 v Australia 🇦🇺 World Cup ⚽️ match and Mariners ⚾️ home game day. 2️⃣8️⃣0️⃣0️⃣0️⃣0️⃣

My presentation, Making Performance Allies from @perfnow.nl just got posted to YouTube - www.youtube.com/watch?v=ygdx.... The tips I share in the presentation were designed to make #webperf stick beyond the occasional task that finds its way out of the backlog. Enjoy!

Video from @paulcalvano.bsky.social's "Introduction to the HTTP Archive" from April is up on our YouTube channel! www.youtube.com/watch?v=UCy6... Subscribe for more! #webperformance #nyc

WELCOME TO WASHINGTON, SOCCER FANS. Get acquainted with our state via this highly accurate and mostly-to-scale map.

My talk from @perfnow.nl is out! It was a super special time compiling years of information on Accessibility and Performance into one talk. Even cooler that my little family could be there in Amsterdam to see it. 💗 youtu.be/Fdvk_qOKjVM?... #a11y

贈貓詩 For My Cat 執鼠無功元不劾，一簞魚飯以時來。 看君終日常安臥，何事紛紛去又回？ You haven’t caught any mice. I let it go. The fish and rice were set out at the appointed hour. I watched you drowse the day away — so now What’s got you galloping madly everywhere? --Lu You 陸游 (1125-1210)

Otter #222 🦦

Mobile teams deserve their Core Web Vitals moment. That’s why Embrace is building Core Mobile Vitals: a rigorous, user-focused framework for understanding mobile app performance through the experiences users actually notice. Read more from @tammyeverts.com: shorturl.at/5A8Ye

Decided to wander out for a Wing Wednesday deal, & I succeeded in convincing someone to try Fernet & Malort on their own tab. This feels like some sort of bar persuasion accomplishment.

MetaFilter! (FYI, we're one of the last bastions of Web 1.0 that's still a going concern! And these days i'm on the Board!)

Ticket sales are open! perfnow.nl/tickets.html

ME, IN A MYTH: sorry about injuring you. in repayment for the damages, here's some grain CAT: thanks. this is either adequate or insufficient in a way that will work out poorly for you ME: that's what makes this a myth CAT: it's what makes this a myth

The best stock photo sources these days are very specific people who take photos of very specific things. This guy takes pictures of trains. All trains all the time. Only trains. Do I have to worry that one of these photos is AI? Nope. He would never disrespect a real train in that way.

gwen does fantastic work as usual on some of the 401,000 trans people who’ve had to flee hostile territory in their own country in the past 18 months.

Look at the absolutely bonkers collection of songs on this CD compilation I bought for €1 at the Lisbon flea market

A friend just sent me this perfect piece by Karel Čapek, trans. Dora Round, ‘From the Point of View of a Cat’.

It's our favourite thing when people tell us that they had to sit with a choice in Fallen London for five full minutes. That's how we know you're suffering the correct amount.

Speed still matters. "for every 100 milliseconds slower a store loads, conversion tends to be about 3.5% lower. (...) For every 32 milliseconds slower a store responds to interactions, conversion tends to drop by about 1.5%." www.shopify.com/enterprise/b...

This's a ride of a thread

I *do* love fruit news & listening in on trends for industries I'm not directly in

What an excellent article from our otter friend, Dr. Heidi Island - a professor of biological psychology and behavioral ecology at Pacific University and a member of the International Union for Conservation of Nature’s Otter Specialist Group. www.popsci.com/environment/... #seaotters #riverotters

I wrote about why I quit my job, and how weird and tiring tech feels these days.

Chuck's Hop Shop in #seattle, 16th anniversary. Cheers to making it this far. Thai Lay's Max, extra ridged ghost pepper extra chili. Mild enough on chip 1 you wonder what the fuss is 1, hot enough halfway through the bag you understand.

I am thrilled to announce that Dreams on a Pillow has wrapped up pre-production and we are about to start full production. We can’t do it without your support. We are starting our second round of crowdfunding, to support us you can find out more here www.launchgood.com/1948

I say it every year - if you're even the least bit interested or involved in web performance, this is THE place to be every year. It's the one trip I prioritize my travel budget for. The talks are awesome, but the hallway track is unbeatable. The concentration of experts in one place is insane.

#OnThisDay in 1962, Belgian waffles made their American debut at the Seattle World's Fair. historylink.org/File/10092

Conference organising in 2026 quirksmode.org/quirksblog/a...

Bao is growing up fast! At four months old, our Asian small-clawed otter pup is getting more confident every day. He's splashing, exploring, and discovering new habitats alongside his loving parents.

Would recommend, this was a gripping read

p75 and p90 JavaScript bytes on the web have exploded since May, 2025—easily the largest 10 month period based on HTTP Archive data since 2023. The long-tail is getting worse, very quickly. Gemini, what happened in May 2025?

🚀 Real User Monitoring from @calibreapp.com has arrived Session-based Core Web Vitals monitoring. See actual DOM elements dragging your site down. No cookies, no bloat, predictable pricing. Let's go! calibreapp.com/blog/real-user-monitoring

✨ Core Web Vitals Summit: The Videos ✨ I'll be sharing the recorded sessions from the Summit stream, and some brief commentary on some takeaways and significance. All are welcome to join the conversation! 📆 Monday March 23rd ⏰ 1pm EST, 10am PST 🔗 www.youtube.com/live/LXYcknO...

Eid Mubarak. Here is my daughter fending off a Beirut cat who belongs to the cafe but wanders in and out depending on the menu. If you celebrate, may your meal be as tempting as the makdous bi labneh was to this kitty.

Coming up: April 16th — Paul Calvano presents "Introduction to the HTTP Archive": www.meetup.com/web-performa... April 30th — Meet4SPEED hands-on session: www.meetup.com/web-performa...

@newyorker.com hit the nail on the head with this one 😂 #Seaotters are highly intelligent marine mammals that use tools, like a rock 🪨, to crack open the hard-shelled invertebrates they love to eat, such as crabs 🦀. #otters #cartoon #newyorkermagazine #seaotter #newyorker

Both showers and public transit rides have 3x multipliers to Thinking Time. You'd think stationary bikes would be too because they're both moving and mindless but actually they're 0.5x at best. Long flights have 10x to Thinking Time but only if you're in the sweet spot of tired but not TOO tired

The performance team I lead at Automattic is hiring - automattic.com/work-with-us... #webperf #php #jobs #wordpress #woocommerce

Breaking News: Baby Bao found another stick! The 3-month-old otter pup was really proud to show it off and even share it with his mom, Pintar. 💙

Interested in the @httparchive.org and not sure where to start? During the @performanceobserver.dev meetup tomorrow (12:30pm ET), I'm going to be providing an overview of the HTTP Archive and demonstrate how to start querying it! performanceobserver.dev/events/episo...

Bao, meaning “treasure” in Vietnamese, represents more than a milestone for our zoo. His birth was recommended by the Association of Zoos & Aquariums Species Survival Plan® (SSP), a science-based program supporting the long-term survival of this highly vulnerable species. 2/2

Two things growing otter pup, Bao, loves: eating seafood and playing with sticks! 💙 As first-time parents, Pintar and Sebastian have done an exceptional job raising Bao behind the scenes. Now three months old, he’s ready to make his public debut this weekend. 1/2

How it started: early construction taking shape. How it’s going: a fully connected 2 Line. Years of planning, precision, and teamwork are leading to one historic connection, opening March 28. See more photos: https://www.soundtransit.org/blog/platform/then-now-crosslake-connection-journey-photos

In our rush to align page speed with SEO and business metrics, have we in the #webperf community lost our way? In this post, based on the keynote I gave at #PerfNow a few months ago, I explore how it's not too late to bridge the gap between pragmatism and user delight. www.speedcurve.com/blog/fast/

Seattle gonna Seattle 😅

How do you measure when a component is “ready”? ⏱️ LCP is too global; Element Timing is too specific. 🛠️ I’ve been working with Bloomberg on a new #webperf API: Container Timing. Think of it as “LCP for a web component”, providing aggregated paint timing for a subtree.

A shocking 8.5% of sites that use CDNs deliver some static content directly to end users via cloud storage! Many are not compressing or caching this content either. This comes at a significant performance cost. Details, examples and @httparchive.org stats here - paulcalvano.com/2026-02-09-s...

Our sea otters are celebrating the Seattle Seahawks heading to the Super Bowl with fishy football treats and plenty of otter enthusiasm. 💙🦦💚

Bennie & Clovis Martin, inventors of the po' boy sandwich, to striking workers: "We are with you till h--l freezes, and when it does, we will furnish blankets to keep you warm." Let's bring this energy to 2026: buttondown.com/theswordandt...

@nywebperf.com is looking for speakers for April! Have you made a website faster? Can you get yourself to NYC? Let me know!

"We would have lost so much if we'd driven him away" is the justification. But we lost all those girls. We lost the women they would have become. We lost the work they would have done. Why was his future work so much more valuable than theirs?