SpeedCurve

SpeedCurve | Speed Matters Newsletter Get great performance content – no filler! – delivered to your inbox every month.

Holy moly... our Speed Matters newsletter has gained 1K new subscribers in the past month! The summer edition goes out next week. It's not too late to sign up and join our 18K subscribers!

Browse the archive and sign up here: www.speedcurve.com/newsletter/

(We won't spam you, I promise.)

I’m working with a client who has a very diverse (adverse?) customer base, so we’re sending off some more high fidelity Network and Device information to @speedcurve.com:

SpeedCurve | When to use CrUX, RUM, and Synthetic web performance monitoring Know the strengths and limitations of each tool so you don’t miss out on valuable insights.

CrUX isn't new, but there's still confusion about what it is and when it's useful (and when it's not). This is a FANTASTIC post from @markzeman.com that breaks down the difference between synthetic, RUM, and CrUX data – and when and why to use each tool.

www.speedcurve.com/blog/crux-ru...

#webperf

SpeedCurve | When to use CrUX, RUM, and Synthetic web performance monitoring Know the strengths and limitations of each tool so you don’t miss out on valuable insights.

"Should I use synthetic monitoring, real user monitoring, or CrUX?"

@markzeman.com wrote this helpful post! It includes:

🟠 How synthetic and RUM work
🟠 What is CrUX?
🟠 Is CrUX a substitute for RUM?
🟠 When & why to use each tool
🧀 An obscure cheese metaphor

www.speedcurve.com/blog/crux-ru...

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...

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!

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.

SpeedCurve | A better way to manage performance budgets in SpeedCurve We've made a major update to how you create, manage, and monitor performance budgets in SpeedCurve, and we think you're going to love it.

Performance budgets are your best tool for fighting #pagespeed regressions & staying fast. That's why we've moved budget management into its own Budgets dashboard!

This dashboard makes tracking #webperf thresholds & #UX goals easier and more intuitive than ever.

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

Performance budgets are THE most effective way to stay on top of regressions. Here's an essential guide to get you started: www.speedcurve.com/web-performa...

RUM for a small race-car website: Trying out SpeedCurve, RUMvision, mPulse This Real User Monitoring (RUM) journey all started because this website is not likely to ever make it to the CrUX report. The logic for excluding small websites from the CrUX report makes sense: it m...

"SpeedCurve won on the basis of the return experience. I felt like I could keep coming back to it to see how my website is doing."

It can be tricky to decide on the right RUM tool. We love it when #webperf pros like Morgan Murrah take ours for a test drive!

www.morganwebdev.org/posts/rum-fo...

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!

Quote from Michelle Vu, a performance engineer at Pinterest:"Fighting regressions took priority over optimizations. The reason we decided this was because in the past, when we had performance efforts, engineers who were working on optimizations couldn't really see progress in our performance metrics, because there were so many regressions happening at the same time."

Don't let #pagespeed regressions cancel your optimizations! Add #webperf budgets to your toolbox. Get alerts when pages slow down. Quickly drill down to the root cause so you can speed up your pages and deliver a fast #ux.

🚀 Complete Guide to Performance Budgets: www.speedcurve.com/web-performa...

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.

This essential post by @tammyeverts.com chimes with my experiences; teams I talk with don't understand that there are huge gains to be had when they finally get perf under thresholds that they think of as "impossible" with today's JS-laden stacks:

speedcurve.com/blog/web-perform…

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

This chat with @csswizardry.com and @cliffcrocker.bsky.social is a #webperf must-see! So many great insights, like...

👉 Nearly every site that is a SPA shouldn't be
👉 Ecomm sites shouldn't be built with #JS
👉 The # of images on a page directly affects conversions

www.speedcurve.com/blog/web-per...

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...

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/...

A table that shows how a handful of web performance metrics – Time to First Byte, Start Render, Largest Contentful Paint, Cumulative Layout Shift, and Interaction to Next Paint – stack up against these criteria: Correlates with meaningful content in the browser. Usable out of the box. Broad browser support. Available in both synthetic and real user monitoring. Correlates to business and UX metrics (like conversions and bounce rate).

Feeling overwhelmed by which #webperf / #ux metrics to track? Then this chart is for you.

As you can see, there's no single perfect 🦄 metric – and each one has caveats – but if you start with this set, you'll cover a lot of important bases.

Learn more here: www.speedcurve.com/web-performa...

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

SpeedCurve | NEW! SpeedCurve RUM for your Magento projects Integrate robust real user monitoring into your Magento project in minutes!

We ❤️ great people building apps that empower other folks to use our tools! The new open‑source #Magento module – from Jesper Ingels and the team at Bluebird Day – lets you integrate our RUM into your Magento project in minutes – no coding required!

www.speedcurve.com/blog/real-us...

#corewebvitals

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!

SpeedCurve | Speed Matters Newsletter Get great performance content – no filler! – delivered to your inbox every month.

One of the most fun parts of my job is compiling the monthly @speedcurve.com newsletter – which I just noticed has hit 16K subscribers!

The June edition comes out next week. You can sign up and check out the archive full of #webperf, #ux, and #seo goodness here: www.speedcurve.com/newsletter/

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!

SpeedCurve | NEW! SpeedCurve RUM for your Shopify store Track Core Web Vitals, identify performance issues, measure the impact of site speed on conversion rates, and stay ahead of page slowdowns – all with no coding required.

Exciting news for our #Shopify customers: Now it's easy to enable RUM in your storefront – no coding required!

⚡ Track #UX metrics like #CoreWebVitals
⚡ Measure impact of #sitespeed on conversion & bounce rates
⚡ Find & fix #webperf issues
⚡ Fight regressions

www.speedcurve.com/blog/speedcu...

Three popular web performance charts. 1. Correlation chart that shows the relationship between page speed metrics, like start render or Largest Contentful Paint, and business metrics, like conversion rate. 2. Waterfall chart that shows a visual timeline of all the resources on a web page, from HTML to images to JavaScript, as they're loaded and rendered in the browser. 3. Competitive benchmarks chart is a leaderboard that ranks your site alongside your competitors, so you can see who's faster and who's slower.

There are SO MANY #webperf charts! If you feel overwhelmed, start with these three:

CORRELATION CHART – #sitespeed and business metrics

WATERFALL CHART – how and when elements on your page render, so you can see why pages are slow

COMPETITIVE BENCHMARKS – how fast you are compared to competitors

LoAF monitoring is a HUGE new feature, because it lets us finally dig into RUM data to diagnose JS issues in the field!

Among the many exciting facets of this release is a new metric – Total Blocking Duration (TBD) – a summary metric that you can set performance budgets and alerts for.

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!

Browser CPU consumption is a major cause of a poor #UX. The main culprit? #JavaScript execution. Now you can monitor Long Animation Frames (LoAFs) and fix the third parties and other scripts that are hurting your page speed!

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

#webperf #js #sitespeed #pagespeed

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.

Not sure what Long Animation Frames (aka LoAF) are, nor why they're crucial for quantifying and optimizing the JavaScript that's hurting your UX? This brilliant guide by @andydavies.me covers:

🔥 Why frame rate matters
🔥 Anatomy of a LoAF
🔥 How to get started

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

Split-screen image of me, Tammy Everts, a white woman with brown hair, standing on stage at the WebExpo Conference in Prague, with a slide from my talk alongside. The slide reads: "Web Stress: When apps or sites are slow, we concentrate up to 50% harder to stay on task."

I do a LOT of talks about the connection between site speed, UX, and business success. The version I gave at @webexpo.bsky.social is my favourite so far. You can watch it here: slideslive.com/39043166

Topics included:
👉 Web stress
👉 Measuring business impact
👉 Optimizing the critical rendering path