Keerthana Krishnan

It was so much fun! The talks were super interesting, the people and vibes are always on point but we really missed you! 🥺

@mmocny.com - I can't seem to text you here somehow but it was super fun hanging out with you today and I hope you have a safe trip back ☺️👋🏻

"Poor wee brain" - I totally read that in your voice in my head 🤣🙈

@rich-harris.dev might have the best demo app I have ever seen 😁 at #perfNow

Accessibility& Performance - perfNow 2025 - Marcy Sutton Todd Accessibility & Performance performance.now() 2025 By Marcy Sutton Todd - Senior Engineer, Frontend Infrastructure at Khan Academy Hi, PerfNow! I'm here to talk to you about the intersection of access...

Here are mine! Thanks for a wonderful conference 🫶🏻 bit.ly/a11y-perfnow25

How to Think Like a Performance Engineer As awareness and tooling around site speed have been improving at a very exciting rate, has performance testing actually become any easier? Any more str…

speakerdeck.com/csswizardry/...

Web Performance Allies - PerfNow 2025 Image credits: https://commons.wikimedia.org/wiki/File:TAR_Detour_clue.png https://commons.wikimedia.org/wiki/File:Carach_Angren_M%C3%A9an_22_08_200…

If you are looking for the slides from my PerfNow 2025 talk, Web Performance Allies, they are at speakerdeck.com/ethangardner...

Super talk from @tunetheweb.com on Speculation Rules. Been nervous about using them for fear of false positives on things like Google Analytics. The upcoming prerender_until_script logic sounds like exactly what I need - you'll benefit from fetching subresources, but won't execute scripts.

#PerfNow

Halloween at #perfnow, pirates and vampires. A.k.a sword fight, the sequel.

Or... How RUMvision slayed Akamai😇😆 (jk)

Stubborn Empathy by Tim Kadlec One of the most important roles we play on the web is as the users line of defense, which requires that we demonstrate stubborn empathy on their behalf. Unfortunately, that concept is all too easy to ...

I appreciate everyone at #perfnow letting me have my "old man yells at cloud" moment this morning.

Slides are now up: noti.st/tkadlec/3imH...

person on stage during a presentation showing a slide that reads SPDY STREAM.

For those who just watched @tunetheweb.com 's presentation, this is the SPDY STREAM he just posted about w/ @yoav.ws + @krzksz.bsky.social of Shopify. Thank again Barry!
#perfNow

🎥 youtu.be/DHgoULxvuJ8

Do you have React Server Components? Have you used <Suspense> correctly? Fascinating investigations into rendering 🕵🏻‍♀️ by @adevnadia.bsky.social at #perfNow

📌 A few year ago, I dared to say that React was the new WordPress. What did I mean?? Devs have for the most part adopted the platform just because. That show of hands during this Nadia Makarevich's talk is proof of it. Orgs hire for React devs often. Wild times.
#perfNow

Web Performance Fundamentals A Frontend Developer’s Guide to Profile and Optimize React Web Apps

For #PerfNow folks (and other folks who are interested in front-end #webperf)… you should know that @adevnadia.bsky.social has written this amazing resource.

www.getwebperf.com

@adevnadia.bsky.social is not afraid to shout from the stage why she loves SPAs (while acknowledging their drawbacks) and on behalf of all FE devs, I would like to thank her for her bravery 🫡🙏🏻 #perfNow

Vibe coding has turned senior devs into ‘AI babysitters,’ but they say it’s worth it | TechCrunch TechCrunch spoke to experienced coders about their time using AI-generated code about what they see as the future of vibe coding.

One of the newest job descriptions "vibe coding cleanup specialist" techcrunch.com/2025/09/14/v... #perfnow

Michael on stage presenting a web page highlighting various interaction elements

@mmocny.com doing an excellent job of visually explaining how interactions are measured between an MPA and a SPA. #perfnow

@programmingart.bsky.social and I are on the same page for a lot of things but I'm still learning from the master on how much drip a Halloween costume should have #perfNow

@mmocny.com is in the right place because yes, #perfNow is the place which thinks measuring user interaction accurately is suuper cool 😎

A speaker stands on stage at the Performance.now() 2025 conference, presenting a slide titled “LoAF Helpers: Advanced Debugging in DevTools.” The slide displays details about WebPerf Snippets and a highlighted URL link. The audience is seated in front of the stage, watching the presentation.

Huge thanks to @andydavies.me for mentioning the LoAF Helpers WebPerf Snippet at @perfnow.nl!

Honored to be part of the amazing Web Performance community 🫶

🔗 webperf-snippets.nucliweb.net/Interaction/...

#WebPerf #PerfNow #Performance #LoAF #INP #CoreWebVitals

Contribute Passionate about a topic? Working on a new tool? Have a technique you want to teach? Research you've done? Tell the web performance community! Send your articles to ssttoo@ymail.com. Please include: ...

Fellow #perfnow fellows, a reminder that PerfPlanet calendar is coming this December for another edition. And it needs YOU. Please ask if you have any contribution ideas or concerns calendar.perfplanet.com/contribute/

@andydavies.me has the receipts to call out how 1st party scripts (NextJS) usage really mess with performance in a real world example at #perfNow

Be aware of "survivor bias" in your metrics. Users having a fast experience will view more pages and have longer sessions. Your RUM data is always inherently biased towards those with fast experiences.

@andydavies.me #PerfNow #webperf

SpeedCurve | NEW! Monitor Long Animation Frames and get to the bottom of your JavaScript issues Now you can monitor Long Animation Frames (LoAFs) and fix the third parties and other scripts that are hurting your user experience!

Learn more about Total Blocking Duration (TBD), the experimental new metric that @andydavies.me is pioneering. #PerfNow

www.speedcurve.com/blog/long-an...

Andy on stage with a slide reading “Need a refresher on the Event Loop” and citing Jake’s 2018 talk.

In my opinion, any SWE writing client-side JavaScript has a responsibility to understand the Event Loop.

@jakearchibald.com’s ‘In The Loop’ talk is required watching: www.youtube.com/watch?v=cCOL...

(cited by @andydavies.me at #perfnow)

"People with faster experiences do more... the web is biased towards people with faster experiences" - @andydavies.me at #perfNow

Day 2 at #perfnow I'm going to continue to add notes to my blog through the day stuart-mcmillan.com/blog/webperf...

Performance expert Tim Kadlec on stage at the performance.now conference in Amsterdam.

“We are the user’s line of defence” between automated tools that don’t offer accountability.

@tkadlec.bsky.social at #PerfNow

SpeedCurve | The Definitive Guide to Long Animation Frames (LoAF) LoAF lets you identify problem scripts, quantify the impact of third-party scripts, and improve the user experience. Here's everything you need to know to get started.

For #PerfNow folks who want to go even deeper on Long Animation Frames, @andydavies.me wrote the definitive guide.

www.speedcurve.com/blog/guide-l...

@andydavies.me explaining LoAFs (Long Animation Frames) in the context of a page lifecycle - "Normally atleast 1 before FCP" at #perfNow