Cliff Crocker
@cliffcrocker.bsky.social
📤 527
📥 96
📝 36
I’m here for the RUM, WebPerf and dad jokes.
reposted by
Cliff Crocker
Eric Bailey
7 days ago
"Websites that work perfectly in traditional browsers may end up broken for actual accessibility tools. The web will fragment as sites must test against a growing number of AI browser agents with different requirements."
www.coryd.dev/posts/2025/a...
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AI browsers are straight out of the enshittification playbook • Cory Dransfeldt
Enshittification isn't cliché, it's simply pervasive. Browsers being launched by AI companies will, undoubtedly, follow the same playbook we've seen over and over again.
https://www.coryd.dev/posts/2025/ai-browsers-are-straight-out-of-the-enshittification-playbook
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Barry Pollard
14 days ago
This one got released rather quietly and I think could do with a bit more attention! Read about how to avoid caching performance penalties due to tracking query params and the like!
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Stoyan Stefanov
22 days ago
Web Performance Calendar day 15 with
@nicj.net
,
@cliffcrocker.bsky.social
and
@karlijnlowik.bsky.social
Löwik presenting an update on W3's RUM Community Group and YOU
calendar.perfplanet.com/2025/rumcg-a...
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RUMCG - A year in review
performance.now() 2024 was the year we officially launched the W3 RUM Community Group. The idea to form a community group around real user monitoring (RUM) came from the desire to come together as ven...
https://calendar.perfplanet.com/2025/rumcg-a-year-in-review/
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Barry Pollard
25 days ago
LCP and INP are now Baseline newly available /since they are now available in all major browsers! 🎉🥳🍾 Really, really, really curious to see what sort of new performance insights we’ll see as sites start to collect and look at the data!
#CoreWebVitals
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Cliff Crocker
Henri Helvetica 🧑🏾🚀🇭🇹
28 days ago
Since it was mentioned by
@cliffcrocker.bsky.social
on the
@embrace.io
x
@speedcurve.com
webinar: A reminder that Mike K of
@cloudflare.social
is my guest tomorrow to talk about TELESCOPE. Really excited for this one. Join us! 📆 Wed Dec 10th ⏰ 2pm EST 🔗
www.youtube.com/live/hhNFI_X...
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Really excited for this. Telescope is so hot right now.
add a skeleton here at some point
28 days ago
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Mandy
about 1 month ago
I’ve been seeing a lot of AI talks and articles lately - I have no idea what’s going on but it has got me wondering about Performance and accessibility and I only have more questions. “People deserved a better web. Will AI be the one who gets it?”
medium.com/@mandy.micha...
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People deserved a better web. Will AI be the one who gets it?
Like many people in the web industry I’ve been keeping an eye on the “state of AI” and what it means for my job, and my day to day life. To…
https://medium.com/@mandy.michael/people-deserved-a-better-web-will-ai-be-the-one-who-gets-it-9b7192af3f0e
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Tammy Everts 🍁
about 2 months ago
#PixelPalooza
is coming up this Thursday! This awesome FREE online event covers how to make sure all those helpful images and videos on your site don't hurt
#webperf
and
#a11y
. I'm joining
@seancdavis.com
to talk about the hidden cost of media on the web. Get your ticket 👉
cfe.dev/events/pixel...
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PixelPalooza 2025
PixelPalooza will explore all the best practices we, as developers, can leverage media like images, video, audio and documents across our sites and applications.
https://cfe.dev/events/pixelpalooza-2025/
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zeldman
about 2 months ago
They say AI will replace the web as we know it, and this time they mean it. Here follows a short list of previous times they also meant it,…
https://zeldman.com/2025/10/25/receipts-a-brief-list-of-prominent-articles-proclaiming-the-death-of-the-web/?utm_source=bluesky&utm_medium=jetpack_social
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Joseph Wynn
about 2 months ago
6 years ago I started a side project to build a web accessibility tool that prioritises simple reporting and quick feedback loops so that teams can fix a11y regressions before they affect users. I am so proud to say that side project is now finished, and A11y Pulse is live.
www.a11ypulse.com
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A11y Pulse
A11y Pulse: Automated accessibility testing for your website. Improve your site's accessibility and compliance with ease.
https://www.a11ypulse.com/
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Cliff Crocker
Jen Simmons
2 months ago
Curious about web technology coming to Safari? How about field-sizing, position-visibility, random(), scrollbar-color, hidden=until-found, auto-expanding <details>, command & commandfor, Largest Contentful Paint, CHIPS, scrollend event, Navigation API & more!
developer.apple.com/documentatio...
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Safari 26.2 Beta Release Notes | Apple Developer Documentation
Released November 4, 2025 — 26.2 beta (20623.1.12)
https://developer.apple.com/documentation/safari-release-notes/safari-26_2-release-notes
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Seeing everyone this week at
#perfnow
was a gift. So many great humans focused on an important cause. Can’t wait for next year!
2 months ago
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Cliff Crocker
Tim Kadlec
2 months ago
Always, always happy to see
@yoav.ws
get a shout-out. So much incredible work has happened because of him. Most recent example—speculation rules in WebKit.
#perfnow
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@mmocny.com
doing an excellent job of visually explaining how interactions are measured between an MPA and a SPA.
#perfnow
2 months ago
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Cliff Crocker
Joan León
2 months ago
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
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So fortunate to work with this guy. Hard-pressed to find anyone with more knowledge on LoAF than
@andydavies.me
. That shirt though…
#perfnow
2 months ago
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@tkadlec.bsky.social
is not only an ambassador of user experience he’s also the king of bad dad jokes.
#perfnow
#perfdad
2 months ago
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Cliff Crocker
Tammy Everts 🍁
2 months ago
Good morning and happy Halloween,
#PerfNow
friends! So excited about Day 2! If you’d like to chat about
#webperf
and
#ux
, come chat with
@andydavies.me
and
@cliffcrocker.bsky.social
and me from Team
@speedcurve.com
. And I still have plenty of Halloween goodies! Trick or treat!
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Cliff Crocker
Riccardo Margiotta
2 months ago
Google's performance thresholds are not your thresholds. Remember that Core Web Vitals are certainly a good starting point, but not the end goal. Don't aim for somebody else's target, correlate with your own real user conversions and set your own goals.
@tammyeverts.com
#PerfNow
#webperf
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Loving the creativity
@inesakrap.bsky.social
is bringing to her talk on building a sustainable, fast web.
#perfnow
2 months ago
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Cliff Crocker
Tammy Everts 🍁
2 months ago
“As performance-minded technologists, you are in a position to do something about accessibility.” —
@marcysutton.com
at
#PerfNow
marcysutton.com/accessibilit...
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Accessibility and Performance | MarcySutton.com
Musings about frontend code, accessibility, web development consulting, and life.
https://marcysutton.com/accessibility-and-performance
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Cliff Crocker
Tammy Everts 🍁
2 months ago
And last (but definitely not least) here’s
@cliffcrocker.bsky.social
’s super-interesting analysis of INP and its correlation with UX and business metrics.
#PerfNow
www.speedcurve.com/blog/INP-use...
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SpeedCurve | Does Interaction to Next Paint actually correlate to user behavior?
If you make INP faster, will it actually improve the user experience... and help your business? Here's our analysis.
https://www.speedcurve.com/blog/INP-user-experience-correlation/
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@tammyeverts.com
kicking off
@perfnow.nl
with a focus on what really matters. Users.
2 months ago
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Great start to my favorite week with our first in person
#RUMCG
meeting before
@perfnow.nl
What’s RUMCG?
www.w3.org/community/ru...
2 months ago
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Cliff Crocker
The Onion
2 months ago
Trump Touts Productive Call With Putin About Ballroom Sconces
https://theonion.com/trump-touts-productive-call-with-putin-about-ballroom-sconces/
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Cliff Crocker
Sherrilyn Ifill
2 months ago
So they didn’t like the ad. Let’s just post Reagan’s 5 min speech against tariffs as it appears on YouTube. Over and over. On all platforms (some of y’all are still on X). *1981 Sherrilyn horrified by 2025 Sherrilyn saying “let’s post Reagan’s speech.”
youtu.be/5t5QK03KXPc
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President Reagan's Radio Address on Free and Fair Trade on April 25, 1987
YouTube video by Reagan Library
https://youtu.be/5t5QK03KXPc
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Cliff Crocker
Kevin M. Kruse
2 months ago
Over the past week, the president said the DOJ should pay him a quarter billion dollars, bulldozed half the White House to build himself a gaudy ballroom, bragged about murdering civilians in international waters, pardoned some more criminals, directed federal prosecutors to indict his opponents ...
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Cliff Crocker
Jake Archibald
3 months ago
We've already had a great response to this. Thank you everyone who took the time to make a ranking - I know there's a lot of proposals. If you haven't, there's still time!
bsky.app/profile/fire...
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Cliff Crocker
Ryan Townsend
3 months ago
Safari TP 230 includes support for Largest Contentful Paint 🙌
#webperf
add a skeleton here at some point
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Cliff Crocker
performance.now() conference
3 months ago
OK, we're down to our last tickets. There's still room for people to join
performance.now()
on 30th and 31st of October (in two weeks and a bit), but it's time to decide.
perfnow.nl
Last tickets at
perfnow-2025.eventstack.shop
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performance.now(); 30th and 31st of October, Amsterdam
On 30th and 31st of October, 2025, the sixth edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.
https://perfnow.nl
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Cliff Crocker
Tammy Everts 🍁
3 months ago
I've been exploring
@speedcurve.com
's new Vitals Overview dashboard with some customers for a week or so now, and all I can say is WOW. Not only is it fun to play with, it also halves the time it takes to investigate
#webperf
and
#ux
issues. 👉 Take a quick tour:
www.speedcurve.com/blog/a-smart...
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SpeedCurve | NEW! A smarter way to spot performance issues
We’re excited to announce the launch of the Vitals Overview dashboard in SpeedCurve. It's your new starting point for exploring the performance of your site.
https://www.speedcurve.com/blog/a-smarter-way-to-spot-performance-issues/
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Cliff Crocker
Alejandra Caraballo
4 months ago
The trans partner of Tyler Robinson had no knowledge about it and was told to delete messages but didn't and instead turned them immediately over to the police and cooperated. Yet, the right is demonizing her and blame everything on trans people despite the trans person here doing the right thing.
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Sia Karamalegos
5 months ago
Need help with web performance optimization? Have a tricky new build you're working on? I have two projects wrapping up and am available for new ones starting next week.
sia.codes/services/
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Services
Failing your Core Web Vitals? Losing conversions due to poor user experience from slow loading, delayed interactions, or shifting content? I’m here to help.
https://sia.codes/services/
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Cliff Crocker
Mark Hamill
5 months ago
The body language alone speaks VOLUMES.
#SlavaUkraine
🇺🇦
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Cliff Crocker
Harry Roberts
5 months ago
Same code, same infrastructure, different context. Web performance is sometimes an ‘us thing’ and sometimes a ‘them thing’. For better or worse, we have a responsibility to cater to both.
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Cliff Crocker
Henri Helvetica 🧑🏾🚀🇭🇹
5 months ago
✨SPDY STREAM 006 ✨ Thank yous!
@cliffcrocker.bsky.social
@karlijnlowik.bsky.social
@bluesmoon.info
We had a great audience, and an even better chat around W3C RUM CG. Video will be edited shortly and shared. The original live stream was pulled down. Thank you again for joining us!
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Cliff Crocker
Alex Russell
5 months ago
<its_happening.gif>
open-web-advocacy.org/blog/japan-a...
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Japan: Apple Must Lift Browser Engine Ban by December - Open Web Advocacy
https://open-web-advocacy.org/blog/japan-apple-must-lift-engine-ban-by-december/
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Cliff Crocker
Henri Helvetica 🧑🏾🚀🇭🇹
5 months ago
✨ SPDY STREAM 006 ✨ 1PM EST, 5PM CET Tomorrow, I'm hosting a great session for anyone familiar OR unfamiliar with Real User Monitoring (RUM). We'll be joined by experienced RUM data, web performance professionals who will share their expertise but mainly discuss the W3C RUM Community Group. Join us!
add a skeleton here at some point
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Cliff Crocker
Science Be 🏳️🌈
5 months ago
"The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command." ~ George Orwell, 1984
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Barry Pollard
5 months ago
Wanna measure Core Web Vitals for for SPAs? Well we've been working on the Soft Navigations API for that and we're launching a new origin trail from Chrome 139. More details here:
developer.chrome.com/blog/new-sof...
And the docs have also been updated:
developer.chrome.com/docs/web-pla...
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New Soft Navigations origin trial | Blog | Chrome for Developers
New Soft Navigations origin trial launching to help measure Core Web Vitals for Single Page Applications (SPAs)
https://developer.chrome.com/blog/new-soft-navigations-origin-trial?hl=en
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Cliff Crocker
Barry Pollard
5 months ago
Great post from
@cliffcrocker.bsky.social
from
@speedcurve.com
investigating Long Animation Frames (LoAFs) and their correlation to business metrics:
www.speedcurve.com/blog/long-an...
Are you measuring LoAFs on your site? Helps with INP and beyond!
#webperf
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SpeedCurve | How do Long Animation Frames affect user behavior?
Let's answer this question with real-world data from real websites.
https://www.speedcurve.com/blog/long-animation-frames-user-behavior/
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Cliff Crocker
Tammy Everts 🍁
6 months ago
Great findings in this post by
@cliffcrocker.bsky.social
! If a
#webperf
metric doesn't align with user behavior or business outcomes, how useful is it? Cliff investigates the relationship between new LoAF metrics and conversion rate across four retail websites.
www.speedcurve.com/blog/long-an...
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SpeedCurve | How do Long Animation Frames affect user behavior?
Let's answer this question with real-world data from real websites.
https://www.speedcurve.com/blog/long-animation-frames-user-behavior/
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Cliff Crocker
Alex Russell
6 months ago
Just published a new section on my site to capture references to a lot of the essential web performance and fundamentals-oriented webdev resources I find myself continually directing folks to. Also, lots and lots of links to blogs I love:
infrequently.org/links/
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Links, Resources, and Humans of Note - Infrequently Noted
Alex Russell on browsers, standards, and the process of progress.
https://infrequently.org/links/
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Tammy Everts 🍁
6 months ago
FACT: Every industry-leading site that I know of uses performance budgets to stay fast. It's never too late to join the club.
add a skeleton here at some point
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Cliff Crocker
God
6 months ago
If they think Superman is woke, wait until they learn about Jesus.
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Tammy Everts 🍁
6 months ago
Return experience overall winner: SpeedCurve! 🏆🏆🏆 I love that Morgan not only makes a case for investing in real user monitoring for smaller sites, but also gives background for setting up the tools he tested. This is a great read for anyone who's getting started with
#webperf
. Thanks, Morgan!
add a skeleton here at some point
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Cliff Crocker
Tammy Everts 🍁
6 months ago
When you write a tech book, you don't do it for 💰💰. You do it to share a topic you're passionate about. When I get a royalty for my book, I don't think "Time to go shopping!" I think "Folks want to learn about one of my favourite topics!" If you've read my book, thank you! I'd love your feedback!
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Cliff Crocker
Kevin Farrugia
6 months ago
I'm looking to recruit talented senior engineers that have experience related to web performance monitoring and optimization. If that sounds like you—or someone you'd highly recommend—please send me a DM and I’ll share more details! The role is 100% remote and async-first.
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Cliff Crocker
Republicans Against Trumpism
6 months ago
Ronald Reagan: “Anyone, from any corner of the Earth, can come to live in America and become an American…This, I believe, is one of the most important sources of America's greatness.”🇺🇸🇺🇸
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Happy to announce the
@speedcurve.com
#perfhero
for the month of June, Harry Roberts!
@csswizardry.com
I had a catch up with Harry and talked all things webperf. Have a listen!
www.speedcurve.com/blog/web-per...
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SpeedCurve | Performance Hero: Harry Roberts
Harry makes huge brands fast, and then generously shares his insights with the community. Thank you, Harry!
https://www.speedcurve.com/blog/web-performance-hero-harry-roberts/
6 months ago
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