Cliff Crocker

✨ 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!

"The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command."
~ George Orwell, 1984

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)

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...

SpeedCurve | How do Long Animation Frames affect user behavior? Let's answer this question with real-world data from real websites.

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

SpeedCurve | How do Long Animation Frames affect user behavior? Let's answer this question with real-world data from real websites.

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...

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/

FACT: Every industry-leading site that I know of uses performance budgets to stay fast.

It's never too late to join the club.

If they think Superman is woke, wait until they learn about Jesus.

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!

A blue book cover. The title of the book is Time is Money: The Business Value of Web Performance". The author is Tammy Everts.

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!

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.

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.”🇺🇸🇺🇸

SpeedCurve | Performance Hero: Harry Roberts Harry makes huge brands fast, and then generously shares his insights with the community. Thank you, Harry!

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...

Pumped for this. The line-up is stacked (with more coming soon) & the community around the event has gotten better and better each year with amazing conversations throughout, side events, large standards & browser involvement—it's wild to think about how this has taken off from its 1st year.

RUM for all! 🍹

Being able to monitor real user experiences is more important than ever. And now it's easier than ever, with integrations like this new open-source SpeedCurve
#Magento module and our recent #Shopify RUM app.

#pagespeed #sitespeed #webperf #ux #corewebvitals

On Juneteenth, we celebrate freedom and recommit ourselves to the work that remains undone. We remember that even in the darkest hours, there is cause to hope for tomorrow’s light.

When you get a chance to commission a Shopify app from a Shopify expert – who also happens to be a lovely person in every way – you say YES! Thank you, Sia, for helping us bring RUM to our #Shopify customers!

We’ve heard from a lot of Shopify customers who’ve been asking for an easier way to integrate our RUM into their storefronts. With this app, not only can you can easily start collecting RUM data, your page labels and soon, conversion tracking, are enabled as well!

Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025] What do the most successful websites have in common? They’re all fast. Faster sites have happier users. Those happy users visit your site more often and…

Thanks again to everyone who came to my #WebExpo talk about the intersection of site speed, #UX and business metrics – and how to make a data-driven business case for investing in #webperf.

My slides are up. I'd love to hear your questions and feedback!

speakerdeck.com/tammyeverts/...

Image of a hand holding a 9 Volt energizer battery.

If you have childhood memories of putting your tongue on this growing up, give it a RT! 👅⚡️

Featured posts this week:
⚡ Performance improvements with Edge 134: Microsoft Edge
⚡ Advanced React in the Wild: @addyosmani.bsky.social
⚡ WordPress 6.8 perf improvements: @felixarntz.bsky.social
⚡ Performance Hero: @infrequently.org: @cliffcrocker.bsky.social
Special thanks to the authors.🙏

SpeedCurve | Why you need to know your site's performance plateau (and how to find it) Have you ever wondered why your site got faster, but your business and user engagement metrics didn't change? Here's why.

Say you've done all the right things. You've lazy-loaded and compressed and minified. You've seen improvements to Start Render or LCP or INP. But bounce rate or conversions didn't improve. WHY?

The answer might lie on the #webperf plateau.

www.speedcurve.com/blog/web-per... #ux #corewebvitals

SpeedCurve | Performance Hero: Alex Russell Our newest performance hero is passionate, provocative, and unapologetically honest. Join us in celebrating Alex Russell!

This month's performance hero is a person after my own heart – passionate about building a secure, accessible, performant web for EVERYONE, and who always leads with a deep compassion for users. Let's all join in celebrating Alex Russell (@infrequently.org)!

www.speedcurve.com/blog/perform...

SpeedCurve | Performance Hero: Alex Russell Our newest performance hero is passionate, provocative, and unapologetically honest. Join us in celebrating Alex Russell!

We are thrilled to recognize @infrequently.org as this month's @speedcurve.com Performance Hero. Alex is honest, direct and extremely passionate in his fight for keeping the web platform alive and accessible for all. #perfhero
www.speedcurve.com/blog/perform...

Screenshot of text that reads: Interaction to Next Paint (INP). Limited browser availability. INP measures the time from when a user initiates an interaction until the next frame is painted. Only the following interactions are observed: mouse click, touchscreen tap, and a physical or onscreen key press. INP has replaced First Input Delay (FID) as a core web vital as of March 2024. Interaction to Next Paint is one of Google's Core Web Vitals, along with Largest Contentful Paint and Cumulative Layout Shift.

How well do you know common #webperf metrics? Did you know...

🙋 INP is only available in RUM and is not supported in Safari?
🙋 LCP is not reliable in SPAs?
🙋 User Timing is available across all browsers?

Test your knowledge: www.speedcurve.com/web-performa...

#ux #corewebvitals #pagespeed

Best Practices for Creating a Culture of Web Performance | SpeedCurve What do the most successful websites have in common? They all have a strong culture of web performance and usability.

Behind the scenes of EVERY successful site is a crew of folks who care deeply about UX. Are you doing all you can to create a culture of #webperf and usability throughout your org? Not only will it lighten your load, it's also fun!

www.speedcurve.com/web-performa...

#ux #sitespeed #pagespeed

Yep

I had so much fun writing this book… though phew, it was WORK. I’m so grateful that it’s largely evergreen content!

💰 Day 020 #100DaysOfPerf: in a fun follow up to yesterday's share, today's post highlights @tammyeverts.com's @oreilly.bsky.social release:
✨ TIME IS MONEY : The Business Value of Web Performance ✨
This is about how fast means good ux and happy customers! 🙃
Preview:
🔗 www.google.ca/books/editio...

Image with a quote that reads: "Downtime is better for a B2C web service than slowness Slowness makes you hate using the service. Downtime you just try again later." by Lenny Rachitsky, Former product lead, Airbnb

Day 019 #100DaysOfPerf: What's better?? DOWN time or SLOW times? Data shows having a slow site is much more deleterious to customer retention w/ a near 3/10 customer NEVER returning, at GREAT finan¢ial £o$$es. @speedcurve.com's very own @tammyeverts.com opines!
🔗 www.speedcurve.com/blog/downtim...