SpeedCurve
@speedcurve.com
SpeedCurve is now part of Embrace.io!
Since 2013, we've helped thousands of companies – from Amazon to Zillow – monitor and improve their site speed and UX (including and beyond Core Web Vitals). Learn more & start your free trial at speedcurve.com!
Since 2013, we've helped thousands of companies – from Amazon to Zillow – monitor and improve their site speed and UX (including and beyond Core Web Vitals). Learn more & start your free trial at speedcurve.com!
Pinned
SpeedCurve
@speedcurve.com
· Nov 19
SpeedCurve | About The Team
We aim to make the internet faster for everyone. SpeedCurve focuses on measuring the design & performance of websites to help you deliver an enjoyable and fast experience to your users.
www.speedcurve.com
Hi, we're so happy to be here! Meet our small but mighty team: www.speedcurve.com/about/
Andy Biggs
Cliff Crocker @cliffcrocker.bsky.social
Andy Davies @andydavies.me
Tammy Everts @tammyeverts.bsky.social
Elena Kay
Steve Souders
Joseph Wynn @josephwynn.bsky.social
Mark Zeman @markzeman.bsky.social
Andy Biggs
Cliff Crocker @cliffcrocker.bsky.social
Andy Davies @andydavies.me
Tammy Everts @tammyeverts.bsky.social
Elena Kay
Steve Souders
Joseph Wynn @josephwynn.bsky.social
Mark Zeman @markzeman.bsky.social
SpeedCurve has been acquired by @embrace.io! We’re combining forces to connect performance, reliability and UX across web and mobile apps.
And yes, our team and tools will remain the same. 😀
Our founder @markzeman.com shares how our 12-year journey led us here: www.speedcurve.com/blog/perform...
And yes, our team and tools will remain the same. 😀
Our founder @markzeman.com shares how our 12-year journey led us here: www.speedcurve.com/blog/perform...
November 12, 2025 at 3:31 PM
SpeedCurve has been acquired by @embrace.io! We’re combining forces to connect performance, reliability and UX across web and mobile apps.
And yes, our team and tools will remain the same. 😀
Our founder @markzeman.com shares how our 12-year journey led us here: www.speedcurve.com/blog/perform...
And yes, our team and tools will remain the same. 😀
Our founder @markzeman.com shares how our 12-year journey led us here: www.speedcurve.com/blog/perform...
Reposted by SpeedCurve
I love heatmaps so much! They're the best way to get instant insight into where #webperf issues are lurking across your site.
Taking it even further, you also get breakdowns across dimensions like page label, browser, device, and location. *chef's kiss*
👉 www.speedcurve.com/blog/new-hea...
Taking it even further, you also get breakdowns across dimensions like page label, browser, device, and location. *chef's kiss*
👉 www.speedcurve.com/blog/new-hea...
SpeedCurve | NEW! Heatmaps now available on Favorites Dashboards
We’ve finally added heat maps to your Favorites (custom) dashboards — one of our most requested features ever! It feels great to finally make this available to everyone.
www.speedcurve.com
November 6, 2025 at 7:39 PM
I love heatmaps so much! They're the best way to get instant insight into where #webperf issues are lurking across your site.
Taking it even further, you also get breakdowns across dimensions like page label, browser, device, and location. *chef's kiss*
👉 www.speedcurve.com/blog/new-hea...
Taking it even further, you also get breakdowns across dimensions like page label, browser, device, and location. *chef's kiss*
👉 www.speedcurve.com/blog/new-hea...
Reposted by SpeedCurve
Slides from my @perfnow.nl talk — How Fast Is Fast Enough? — are up!
If you’re at #PerfNow (or even if you’re not) I’d love to talk about creating a delightful experience for your users.
speakerdeck.com/tammyeverts/...
If you’re at #PerfNow (or even if you’re not) I’d love to talk about creating a delightful experience for your users.
speakerdeck.com/tammyeverts/...
How Fast Is Fast Enough? [PerfNow 2025]
It sounds like a simple question, but if you've been working in web performance long enough, you know the answer is far from straightforward. In this ke…
speakerdeck.com
October 30, 2025 at 9:30 AM
Slides from my @perfnow.nl talk — How Fast Is Fast Enough? — are up!
If you’re at #PerfNow (or even if you’re not) I’d love to talk about creating a delightful experience for your users.
speakerdeck.com/tammyeverts/...
If you’re at #PerfNow (or even if you’re not) I’d love to talk about creating a delightful experience for your users.
speakerdeck.com/tammyeverts/...
Reposted by SpeedCurve
Sharing a few of the sources I cited during my #PerfNow talk, I’ll start with this one…
Here’s a deeper dive into how to create correlation charts that help you see the relationship between performance metrics and business/engagement metrics.
www.speedcurve.com/blog/site-sp...
Here’s a deeper dive into how to create correlation charts that help you see the relationship between performance metrics and business/engagement metrics.
www.speedcurve.com/blog/site-sp...
SpeedCurve | Correlation charts: Connect the dots between site speed and business success
If you could measure the impact of site speed on your business, how valuable would that be for you?
www.speedcurve.com
October 30, 2025 at 9:41 AM
Sharing a few of the sources I cited during my #PerfNow talk, I’ll start with this one…
Here’s a deeper dive into how to create correlation charts that help you see the relationship between performance metrics and business/engagement metrics.
www.speedcurve.com/blog/site-sp...
Here’s a deeper dive into how to create correlation charts that help you see the relationship between performance metrics and business/engagement metrics.
www.speedcurve.com/blog/site-sp...
Reposted by SpeedCurve
Another source from my #PerfNow talk…
Here’s why you need to know the performance plateau for your site.
www.speedcurve.com/blog/web-per...
Here’s why you need to know the performance plateau for your site.
www.speedcurve.com/blog/web-per...
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.
www.speedcurve.com
October 30, 2025 at 9:43 AM
Another source from my #PerfNow talk…
Here’s why you need to know the performance plateau for your site.
www.speedcurve.com/blog/web-per...
Here’s why you need to know the performance plateau for your site.
www.speedcurve.com/blog/web-per...
Reposted by SpeedCurve
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...
www.speedcurve.com/blog/guide-l...
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.
www.speedcurve.com
October 31, 2025 at 9:18 AM
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...
www.speedcurve.com/blog/guide-l...
Reposted by SpeedCurve
Learn more about Total Blocking Duration (TBD), the experimental new metric that @andydavies.me is pioneering. #PerfNow
www.speedcurve.com/blog/long-an...
www.speedcurve.com/blog/long-an...
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!
www.speedcurve.com
October 31, 2025 at 9:31 AM
Learn more about Total Blocking Duration (TBD), the experimental new metric that @andydavies.me is pioneering. #PerfNow
www.speedcurve.com/blog/long-an...
www.speedcurve.com/blog/long-an...
Reposted by SpeedCurve
Making Sense of Long Animation Frames…
The slides from my #PerfNow talk are available on Notist
noti.st/andydavies/9...
The slides from my #PerfNow talk are available on Notist
noti.st/andydavies/9...
Making Sense of LoAF by Andy Davies
Over time the web has become more reliant on JavaScript… but we’ve very little information on how its growth is affecting our visitors’ experience.
noti.st
October 31, 2025 at 4:23 PM
Making Sense of Long Animation Frames…
The slides from my #PerfNow talk are available on Notist
noti.st/andydavies/9...
The slides from my #PerfNow talk are available on Notist
noti.st/andydavies/9...
Reposted by SpeedCurve
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...
www.speedcurve.com/blog/INP-use...
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.
www.speedcurve.com
October 30, 2025 at 9:52 AM
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...
www.speedcurve.com/blog/INP-use...
We ❤️ making users happy! One of our customers (a large healthcare system) had this to say about our tools and service — including kudos to our amazing @cliffcrocker.bsky.social!
👉 Learn how we collaborate with you to build your #webperf and #ux practice: www.speedcurve.com/why/collabor...
👉 Learn how we collaborate with you to build your #webperf and #ux practice: www.speedcurve.com/why/collabor...
October 22, 2025 at 5:19 PM
We ❤️ making users happy! One of our customers (a large healthcare system) had this to say about our tools and service — including kudos to our amazing @cliffcrocker.bsky.social!
👉 Learn how we collaborate with you to build your #webperf and #ux practice: www.speedcurve.com/why/collabor...
👉 Learn how we collaborate with you to build your #webperf and #ux practice: www.speedcurve.com/why/collabor...
Reposted by SpeedCurve
Excessive JS is a UX monster. It hurts important metrics like LCP and INP, which in turn hurts bounce rate and conversion rate.
I dug into this topic in a recent post, where I compared the #webperf of landing pages for well-known sites, from Apple to Uber.
www.speedcurve.com/blog/campaig...
I dug into this topic in a recent post, where I compared the #webperf of landing pages for well-known sites, from Apple to Uber.
www.speedcurve.com/blog/campaig...
SpeedCurve | Are your retail landing pages killing conversions?
How do the campaign landing pages of leading websites compare? Who's fast, who's slow, and what's causing their page speed bottlenecks?
www.speedcurve.com
October 9, 2025 at 7:11 PM
Excessive JS is a UX monster. It hurts important metrics like LCP and INP, which in turn hurts bounce rate and conversion rate.
I dug into this topic in a recent post, where I compared the #webperf of landing pages for well-known sites, from Apple to Uber.
www.speedcurve.com/blog/campaig...
I dug into this topic in a recent post, where I compared the #webperf of landing pages for well-known sites, from Apple to Uber.
www.speedcurve.com/blog/campaig...
Reposted by SpeedCurve
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...
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...
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.
www.speedcurve.com
October 8, 2025 at 8:08 PM
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...
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...
We just added @csswizardry.com to our Web Performance Heroes starter pack! (Yes, it's a bit late, but better late than never.)
Every month, we honour a new hero and add them to this list. Follow along and meet the folks without whom the web would be a sadder and slower place.
go.bsky.app/FTbRtFk
Every month, we honour a new hero and add them to this list. Follow along and meet the folks without whom the web would be a sadder and slower place.
go.bsky.app/FTbRtFk
October 7, 2025 at 10:14 PM
We just added @csswizardry.com to our Web Performance Heroes starter pack! (Yes, it's a bit late, but better late than never.)
Every month, we honour a new hero and add them to this list. Follow along and meet the folks without whom the web would be a sadder and slower place.
go.bsky.app/FTbRtFk
Every month, we honour a new hero and add them to this list. Follow along and meet the folks without whom the web would be a sadder and slower place.
go.bsky.app/FTbRtFk
Reposted by SpeedCurve
Every fall I hear so much FOMO from folks who missed @perfnow.nl. Don't let it happen to you!
We have amazing speakers sharing the newest best practices for the #webperf topics you care about: AI, APIs, #a11y, CSS, JS, frameworks, tools, culture, workflows & more!
Get your tickets soon! perfnow.nl
We have amazing speakers sharing the newest best practices for the #webperf topics you care about: AI, APIs, #a11y, CSS, JS, frameworks, tools, culture, workflows & more!
Get your tickets soon! perfnow.nl
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.
perfnow.nl
October 1, 2025 at 6:45 PM
Every fall I hear so much FOMO from folks who missed @perfnow.nl. Don't let it happen to you!
We have amazing speakers sharing the newest best practices for the #webperf topics you care about: AI, APIs, #a11y, CSS, JS, frameworks, tools, culture, workflows & more!
Get your tickets soon! perfnow.nl
We have amazing speakers sharing the newest best practices for the #webperf topics you care about: AI, APIs, #a11y, CSS, JS, frameworks, tools, culture, workflows & more!
Get your tickets soon! perfnow.nl
Reposted by SpeedCurve
How fast is fast enough? I'll be exploring this question in my #PerfNow keynote. I hope to see you there! And if you have your own thoughts on this question, I'd love to hear them!
#webperf #sitespeed #pagespeed #ux
#webperf #sitespeed #pagespeed #ux
performance.now() is coming!
@tammyeverts.com asks a seemingly-simple question: How Fast Is Fast Enough? She'll touch on questions — ranging from neuroscience to business metrics — to get you thinking about how you create, measure, and report your performance goals.
perfnow.nl/speakers.htm...
@tammyeverts.com asks a seemingly-simple question: How Fast Is Fast Enough? She'll touch on questions — ranging from neuroscience to business metrics — to get you thinking about how you create, measure, and report your performance goals.
perfnow.nl/speakers.htm...
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.
perfnow.nl
September 15, 2025 at 9:40 PM
How fast is fast enough? I'll be exploring this question in my #PerfNow keynote. I hope to see you there! And if you have your own thoughts on this question, I'd love to hear them!
#webperf #sitespeed #pagespeed #ux
#webperf #sitespeed #pagespeed #ux
Reposted by SpeedCurve
Retail ad campaigns are $$$ — yet campaign landing pages are often the slowest pages on a site.
That slowness has a direct impact on conversions. 💸
I tracked landing pages for 19 leading sites to see who's fast, who's slow, and what's causing their bottlenecks.
www.speedcurve.com/blog/campaig...
That slowness has a direct impact on conversions. 💸
I tracked landing pages for 19 leading sites to see who's fast, who's slow, and what's causing their bottlenecks.
www.speedcurve.com/blog/campaig...
SpeedCurve | Are your retail landing pages killing conversions?
How do the campaign landing pages of leading websites compare? Who's fast, who's slow, and what's causing their page speed bottlenecks?
www.speedcurve.com
September 30, 2025 at 6:16 PM
Retail ad campaigns are $$$ — yet campaign landing pages are often the slowest pages on a site.
That slowness has a direct impact on conversions. 💸
I tracked landing pages for 19 leading sites to see who's fast, who's slow, and what's causing their bottlenecks.
www.speedcurve.com/blog/campaig...
That slowness has a direct impact on conversions. 💸
I tracked landing pages for 19 leading sites to see who's fast, who's slow, and what's causing their bottlenecks.
www.speedcurve.com/blog/campaig...
Reposted by SpeedCurve
September 30, 2025 at 12:25 PM
Reposted by SpeedCurve
I recently started instrumenting both @cloudflare.social and browser cache hits/misses and the numbers, while obvious, are compelling. The best request is the one that never happens. Check that 0ms TTFB 😍
℅ @speedcurve.com
℅ @speedcurve.com
September 20, 2025 at 1:07 PM
I recently started instrumenting both @cloudflare.social and browser cache hits/misses and the numbers, while obvious, are compelling. The best request is the one that never happens. Check that 0ms TTFB 😍
℅ @speedcurve.com
℅ @speedcurve.com
Zero-second TTFB FTW!
While a fast Time to First Byte doesn't mean your pages will deliver a fast user experience, a slow TTFB almost certainly guarantees your pages will deliver a slow UX.
Learn more 👉👉👉 www.speedcurve.com/web-performa...
While a fast Time to First Byte doesn't mean your pages will deliver a fast user experience, a slow TTFB almost certainly guarantees your pages will deliver a slow UX.
Learn more 👉👉👉 www.speedcurve.com/web-performa...
I recently started instrumenting both @cloudflare.social and browser cache hits/misses and the numbers, while obvious, are compelling. The best request is the one that never happens. Check that 0ms TTFB 😍
℅ @speedcurve.com
℅ @speedcurve.com
September 22, 2025 at 6:22 PM
Zero-second TTFB FTW!
While a fast Time to First Byte doesn't mean your pages will deliver a fast user experience, a slow TTFB almost certainly guarantees your pages will deliver a slow UX.
Learn more 👉👉👉 www.speedcurve.com/web-performa...
While a fast Time to First Byte doesn't mean your pages will deliver a fast user experience, a slow TTFB almost certainly guarantees your pages will deliver a slow UX.
Learn more 👉👉👉 www.speedcurve.com/web-performa...
🔥 Quick page speed tip! Use critical CSS for faster rendering.
Users will abandon a page if it seems empty and inactive for more than 3 seconds. If they see content rendering or the skeleton of a page loading, you'll buy more time and patience.
👉 Read the guide: www.speedcurve.com/web-performa...
Users will abandon a page if it seems empty and inactive for more than 3 seconds. If they see content rendering or the skeleton of a page loading, you'll buy more time and patience.
👉 Read the guide: www.speedcurve.com/web-performa...
Using Critical CSS for Faster Rendering | SpeedCurve
Using these CSS optimization techniques, you can take control of the browser's rendering process and craft a loading experience that will keep people happier and more engaged.
www.speedcurve.com
September 17, 2025 at 9:17 PM
🔥 Quick page speed tip! Use critical CSS for faster rendering.
Users will abandon a page if it seems empty and inactive for more than 3 seconds. If they see content rendering or the skeleton of a page loading, you'll buy more time and patience.
👉 Read the guide: www.speedcurve.com/web-performa...
Users will abandon a page if it seems empty and inactive for more than 3 seconds. If they see content rendering or the skeleton of a page loading, you'll buy more time and patience.
👉 Read the guide: www.speedcurve.com/web-performa...
Ever wonder why you get DIFFERENT NUMBERS for the SAME METRICS using different #webperf tools?
🕒 Synthetic vs synthetic?
🕕 Synthetic vs RUM?
🕘 RUM vs CruX?
Here are some of the most common reasons. (The most important thing? Track changes within a single tool!)
www.speedcurve.com/web-performa...
🕒 Synthetic vs synthetic?
🕕 Synthetic vs RUM?
🕘 RUM vs CruX?
Here are some of the most common reasons. (The most important thing? Track changes within a single tool!)
www.speedcurve.com/web-performa...
How to Trust Your Web Performance Metrics | SpeedCurve
Have you ever wondered why you get different numbers for the same metrics using different tools? Here are some of the most common reasons.
www.speedcurve.com
September 16, 2025 at 7:16 PM
Ever wonder why you get DIFFERENT NUMBERS for the SAME METRICS using different #webperf tools?
🕒 Synthetic vs synthetic?
🕕 Synthetic vs RUM?
🕘 RUM vs CruX?
Here are some of the most common reasons. (The most important thing? Track changes within a single tool!)
www.speedcurve.com/web-performa...
🕒 Synthetic vs synthetic?
🕕 Synthetic vs RUM?
🕘 RUM vs CruX?
Here are some of the most common reasons. (The most important thing? Track changes within a single tool!)
www.speedcurve.com/web-performa...
Reposted by SpeedCurve
performance.now() is coming!
@tammyeverts.com asks a seemingly-simple question: How Fast Is Fast Enough? She'll touch on questions — ranging from neuroscience to business metrics — to get you thinking about how you create, measure, and report your performance goals.
perfnow.nl/speakers.htm...
@tammyeverts.com asks a seemingly-simple question: How Fast Is Fast Enough? She'll touch on questions — ranging from neuroscience to business metrics — to get you thinking about how you create, measure, and report your performance goals.
perfnow.nl/speakers.htm...
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.
perfnow.nl
September 15, 2025 at 12:16 PM
performance.now() is coming!
@tammyeverts.com asks a seemingly-simple question: How Fast Is Fast Enough? She'll touch on questions — ranging from neuroscience to business metrics — to get you thinking about how you create, measure, and report your performance goals.
perfnow.nl/speakers.htm...
@tammyeverts.com asks a seemingly-simple question: How Fast Is Fast Enough? She'll touch on questions — ranging from neuroscience to business metrics — to get you thinking about how you create, measure, and report your performance goals.
perfnow.nl/speakers.htm...
Reposted by SpeedCurve
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/
I have two projects wrapping up and am available for new ones starting next week.
sia.codes/services/
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.
sia.codes
August 18, 2025 at 12:14 PM
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/
I have two projects wrapping up and am available for new ones starting next week.
sia.codes/services/
Reposted by SpeedCurve
🩺 You don’t *have* to use Obs.js to adapt your site. You can use it as an analytics add-on and send data off to @speedcurve.com! csswizardry.com/Obs.js/demo/...
Obs.js – context-aware web performance for everyone
Obs.js reads device and network signals and allows you to build adaptive user experiences.
csswizardry.com
September 2, 2025 at 1:31 PM
🩺 You don’t *have* to use Obs.js to adapt your site. You can use it as an analytics add-on and send data off to @speedcurve.com! csswizardry.com/Obs.js/demo/...
Reposted by SpeedCurve
One of the fun things about taking holiday time is sitting back at my desk, looking at my monitor, and asking myself "What is it I do again?"
If this sounds like you — and you care about site speed and UX — here's a quick refresher!
👉 👉 Web Performance Guide: www.speedcurve.com/web-performa...
If this sounds like you — and you care about site speed and UX — here's a quick refresher!
👉 👉 Web Performance Guide: www.speedcurve.com/web-performa...
September 2, 2025 at 7:12 PM
One of the fun things about taking holiday time is sitting back at my desk, looking at my monitor, and asking myself "What is it I do again?"
If this sounds like you — and you care about site speed and UX — here's a quick refresher!
👉 👉 Web Performance Guide: www.speedcurve.com/web-performa...
If this sounds like you — and you care about site speed and UX — here's a quick refresher!
👉 👉 Web Performance Guide: www.speedcurve.com/web-performa...