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SpeedCurve
@speedcurve.com
700 followers 300 following 69 posts
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!
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SpeedCurve @speedcurve.com · 19d
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...
Text on a dark blue background: SpeedCurve joins Embrace.
Reposted by SpeedCurve
tammyeverts.com
If you only have time to do ONE THING to make your site holiday-ready (so you can relax and enjoy the next few days off) it's this: CREATE PERFORMANCE BUDGETS

😀 No code changes required
😀 Literally takes just 1-2 minutes
😀 You get alerts if your pages slow down

👉 www.speedcurve.com/web-performa...
A time series chart that shows how a web performance budget works. This chart tracks Cumulative Layout Shift (CLS). Over time the metric fluctuates. The performance budget is represented as a red horizontal line across the chart, which is the predetermined ideal maximum threshold for the metric. When the CLS metric is greater than the budget, it's highlighted in red. When the metric improves and drops below the budget, it returns to normal.
November 25, 2025 at 7:56 PM
Reposted by SpeedCurve
embrace.io
🚨 New EMA Impact Brief: Embrace + @speedcurve.com is a big step forward for modern #observability.

Together they deliver deeper user context, unified mobile + web + synthetic visibility, and an OTel-first foundation built for AI-ready reliability.

Read more ➔ ow.ly/tsXY50XxcpZ
Impact Brief: Embrace Acquires SpeedCurve, Advancing User-Focused Observability with Deep Web Performance Insight
EMA explores how Embrace and SpeedCurve’s combined strengths create a comprehensive experience layer across mobile, web, and backend systems.
ow.ly
November 24, 2025 at 10:12 PM
speedcurve.com
What happens when observability merges with front-end performance monitoring? You get the best of all worlds — performance, reliability, and UX across web and mobile!

Join our founder @markzeman.com, CPO @cliffcrocker.bsky.social, and @embrace.io President Andrew Tunall on December 9 to learn more!
November 24, 2025 at 8:29 PM
Reposted by SpeedCurve
tammyeverts.com
Unoptimized images are STILL a common problem, and they hurt things like:

🙁 #A11y
🙁 #webperf and #UX metrics like LCP and CLS
🙁 Conversions
🙁 #SEO
🙁 Sustainability

I'll be talking about this (and solutions!) today (12:15pm PT / 3:15pm ET) at #PixelPalooza.

Get your FREE ticket: lnkd.in/g_N8YFrs
Pictorial graph that shows relative weight of images on web pages, according to the HTTP Archive. The median page has 1053 kilobytes worth of images, while the 75th percentile page has 2892 kilobytes and the 90th percentile page has 6888 kilobytes.
November 20, 2025 at 6:09 PM
Reposted by SpeedCurve
tammyeverts.com
Third parties represent a MASSIVE potential single point of failure for your site.

1. AUDIT & remove unused tags

2. DEFER or load asynchronously

3. TRACK scripts & create #webperf budgets

4. KNOW your SLAs with vendors

5. CREATE a playbook for failures

👉 www.speedcurve.com/web-performa... #ux
Third-Party Web Performance | SpeedCurve
Ads, analytics, and social widgets can seriously hurt page speed. Find out how to measure and optimize the third parties on your pages.
www.speedcurve.com
November 19, 2025 at 9:12 PM
speedcurve.com
🎄 Holiday Readiness Tip 7: Track your CDN!

CDN performance can be a black box. Did you know you can track CDN health using Server Timing headers?

👉 How to get backend transparency from your CDN: www.speedcurve.com/blog/server-...

👉 More holiday readiness tips: www.speedcurve.com/blog/holiday...
SpeedCurve | 2025 Holiday Readiness Checklist (Page Speed Edition!)
25 things you can do to keep your site fast and your users happy through the holidays and beyond!
www.speedcurve.com
November 18, 2025 at 7:33 PM
Reposted by SpeedCurve
tammyeverts.com
#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...
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.
cfe.dev
November 17, 2025 at 9:57 PM
Reposted by SpeedCurve
tammyeverts.com
Video of my @perfnow.nl keynote is up! In this talk, I challenged the false choice between magic and pragmatism.

Don't settle for "fast enough". Instead, aim to create a user experience that's #pragmagical — blending user delight with measurable business impact.

conffab.com/presentation...
How Fast Is Fast Enough?
<p>It sounds like a simple question, but if you’ve been working in performance long enough, you know the answer is far from straightforward. In this Day 1 keynote, Tammy asks questions—from neuroscien...
conffab.com
November 14, 2025 at 12:10 AM
speedcurve.com
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...
Text on a dark blue background: SpeedCurve joins Embrace.
November 12, 2025 at 3:31 PM
Reposted by SpeedCurve
tammyeverts.com
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...
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
Reposted by SpeedCurve
tammyeverts.com
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/...
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&hellip;
speakerdeck.com
October 30, 2025 at 9:30 AM
Reposted by SpeedCurve
tammyeverts.com
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...
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
Reposted by SpeedCurve
tammyeverts.com
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...
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
Reposted by SpeedCurve
tammyeverts.com
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...
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
Reposted by SpeedCurve
tammyeverts.com
Learn more about Total Blocking Duration (TBD), the experimental new metric that @andydavies.me is pioneering. #PerfNow

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
Reposted by SpeedCurve
andydavies.me
Making Sense of Long Animation Frames…

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
Reposted by SpeedCurve
tammyeverts.com
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...
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
speedcurve.com
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...
Text on a blue background: “SpeedCurve is a great tool — and 75% of the value we get is from our check-in sessions with their team! In our internal quarterly State of the Stack meetings, Speedcurve gets the most consistent accolades as a helpful resource. The platform, and the actual guidance from actual people, has enhanced our website and the knowledge of our team. The check-ins with Cliff are something special: on the calendars as optional for most of the team, yet everyone attends. Working with Speedcurve has allowed us to streamline our monitoring stacks because it is so comprehensive. We don’t need as many tools as we thought we did."
October 22, 2025 at 5:19 PM
Reposted by SpeedCurve
tammyeverts.com
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...
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
Reposted by SpeedCurve
tammyeverts.com
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...
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
speedcurve.com
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
October 7, 2025 at 10:14 PM
Reposted by SpeedCurve
tammyeverts.com
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
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
Reposted by SpeedCurve
tammyeverts.com
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
perfnow.nl performance.now() conference @perfnow.nl · Sep 15
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...
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
Reposted by SpeedCurve
tammyeverts.com
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...
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
Reposted by SpeedCurve
perfnow.nl
Schedule schedule on the wall, who has the best line-up of them all?

perfnow.nl/schedule.html
Screenshot of the performance.now() conference schedule. Follow the link in the main text to read it.
September 30, 2025 at 12:25 PM