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Tammy Everts 🍁

@tammyeverts.com

2.1K followers 320 following 310 posts

I contain multitudes, but for brevity: reader, writer, speaker, baker, quilter, yoga-er, mom-joke teller, lover of lakes and mountains. Fighting the good #UX / #webperf fight as CXO at @speedcurve.com & co-chair of @perfnow.bsky.social.

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Tammy Everts 🍁 @tammyeverts.com · Oct 29

If you want to know the real me, then you need to know that at any given time, roughly 10% of my processing power is revving on the subject of quilts and quilting. I typically have multiple projects in various states of completion. Here's a sampling of quilts I've finished over the past few years.

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Tammy Everts 🍁 @tammyeverts.com · 1d

This is just one snippet among many I could've pulled from this powerful piece by Catherine Jue: www.catherinejue.com/fast

Quote from Catherine Jue: "Fast eliminates cognitive friction. Raycast surfacing the right application before you finish typing feels like an extension of your mind. Superhuman's sub-100ms rule — plus their focus on keyboard shortcuts — changed the email game in a way that no one's been able to replicate, let alone beat... No one praises these tools explicitly for their speed. They just feel magical."

Tammy Everts 🍁 @tammyeverts.com · 5d

Every kid who knows how to take responsibility for their part in a situation — and who knows how to apologize with grace and dignity — learned that from a loving adult in their life. You’re doing great. 💕

Reposted by Tammy Everts 🍁

Matthias Ott @matthiasott.com · 6d

“I feel like web developers are constantly being gaslit into thinking that complex over-engineered solutions are the only option. […] That’s not good for users, and I don’t think it’s good for us either.”

Mic drop by @adactio.com 👏
adactio.com/journal/22178

Simplify

Reminding myself just how much you can do with CSS these days.

adactio.com

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Tammy Everts 🍁 @tammyeverts.com · 6d

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

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Tammy Everts 🍁 @tammyeverts.com · 7d

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

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Reposted by Tammy Everts 🍁

SpeedCurve @speedcurve.com · 8d

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

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Tammy Everts 🍁 @tammyeverts.com · 14d

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

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Tammy Everts 🍁 @tammyeverts.com · 15d

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

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Reposted by Tammy Everts 🍁

Harry Roberts @csswizardry.com · 25d

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

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Tammy Everts 🍁 @tammyeverts.com · 20d

The only thing worse than being forced to get support from a chatbot... is when even the chatbot doesn't want to help you.

A screenshot of a chatbot window, with the following message:

"Hello! I am your AI assistant ready to help you. How can I guide you today?"

This is followed by the deflating message:

"All chat agents are currently busy."

Tammy Everts 🍁 @tammyeverts.com · 27d

Years ago, when I was fretting about something or other, my son (who was around ten years old) quoted this to me. It was exactly what I needed to hear at the time. Maybe you need to hear it today?

(Fast forward ten years. My son and I designed this poster for his university dorm room.)

Stephen Hawking quote: "“One of the basic rules of the universe is that nothing is perfect. Perfection simply doesn't exist. Without imperfection, neither you nor I would exist."

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Reposted by Tammy Everts 🍁

SpeedCurve @speedcurve.com · 28d

🔥 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...

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

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Tammy Everts 🍁 @tammyeverts.com · 29d

"Why don't my numbers match between Tool A and Tool B?"

I get this question a LOT. Here's a good explainer.

SpeedCurve @speedcurve.com · 29d

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...

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

Tammy Everts 🍁 @tammyeverts.com · Sep 15

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

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

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Tammy Everts 🍁 @tammyeverts.com · Sep 8

It would be great to see you there!

Tammy Everts 🍁 @tammyeverts.com · Sep 8

I say this every year and always mean it:

WOW, what a speaker (and MC!) lineup we have for @perfnow.nl conference this year! I can't wait to see all these folks on the stage!

This is when #PerfNow ticket sales start to go bananas — and we always sell out — so lock in your ticket 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

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Tammy Everts 🍁 @tammyeverts.com · Sep 2

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...

Friendly-looking humanoid alien – we call him Herman – sitting on a park bench, using the internet on his laptop.

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Tammy Everts 🍁 @tammyeverts.com · Aug 20

💖 I loved this stroll down memory lane! 💖

Thank you, Joshua Bixby, for being such a fantastic boss and #webperf mentor sixteen (!!!) years ago!

Henri Helvetica 🧑🏾‍🚀🇭🇹 @henrihelvetica.bsky.social · Aug 20

✨ How did you get into performance? ✨ in ~100 seconds.
"We called it Steve Souders in a box!" - @tammyeverts.com 🙃

Tammy shares the moment that led to her career working in web performance as a user experience practitioner.
The full ✨ SPDY STREAM 007 ✨ episode w/ Tammy drops tomorrow at 8am EDT.

Tammy Everts 🍁 @tammyeverts.com · Aug 19

So many great articles in this guide — all written by actual humans!

(Shout-out to @andydavies.me, @cliffcrocker.bsky.social, @tkadlec.bsky.social, Joseph Wynn, @markzeman.com, and Steve Souders!)

SpeedCurve @speedcurve.com · Aug 19

New to the world of web performance? Welcome! Here's everything you need to know to master website monitoring, analytics, and diagnostics. Learn how to deliver a fast, joyous experience to all your users.

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

#webperf #pagespeed #sitespeed #ux #corewebvitals

Cartoon-style illustration of a friendly, six-eyed humanoid alien sitting on a park bench while using a laptop.

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Tammy Everts 🍁 @tammyeverts.com · Aug 19

"Synthetic, RUM, and CrUX data each have their place. It's important to keep in mind the limitations of each monitoring tool and what they're best used for so we don’t make the mistake of overlooking valuable insights."

Excellent explainer from @markzeman.com: www.speedcurve.com/blog/crux-ru...

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.

www.speedcurve.com

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Tammy Everts 🍁 @tammyeverts.com · Aug 19

Screenshot of the AccuWeather app loading screen: a white sun icon on an orange background.

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Tammy Everts 🍁 @tammyeverts.com · Aug 18

Hm... no guesses?

Tammy Everts 🍁 @tammyeverts.com · Aug 18

In today’s edition of “Guess That Unresponsive App”…

Guess this app that would’ve been really helpful — and potentially lifesaving — to access when my family and I were hiking in the mountains yesterday… but which didn’t work because we were on 3G.

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Reposted by Tammy Everts 🍁

Henri Helvetica 🧑🏾‍🚀🇭🇹 @henrihelvetica.bsky.social · Aug 14

✨ SPDY STREAM 007 ✨
Had a great time yesterday w/ @tammyeverts.com + even better conversation about her current focus.
"How fast IS fast?"
This was an important q? she tackled + explained. What is fast on paper may not be in reality, even more so could be slow per your competitor's standards. 🎥 soon

Image of a stream, taking place with two tech professionals, and a browser window is shared that reads the following speed matters, why you need to know your sites, performance plateau, and how to find it.

Image of two professionals during a stream, and both are smiling. One is wearing a yellow cap glasses and speaking into a microphone with yellow foam. The other is in a room with a couch behind looking into the camera.

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Tammy Everts 🍁 @tammyeverts.com · Aug 13

Coming up in less than an hour – at 10am PDT / 1pm EDT!

Henri and I will be chatting about page speed and UX, including the all-important question: How fast is fast enough?

Henri Helvetica 🧑🏾‍🚀🇭🇹 @henrihelvetica.bsky.social · Aug 12

✨ SPDY STREAM 007 ✨
@tammyeverts.com of @speedcurve.com has seen and helped shaped so much in performance. She's an author, conference fave and co-chair for the @perfnow.nl conference. Tammy will share insights you'll want to tune into. Join us!
📆 Wed Aug 13th
⏰ 1PM EDT
🔗 bit.ly/spdy-stream-007

✨ SPDY STREAM 007 ✨ w/ Tammy Everts

With decades working on the web, from performance practices to UX and even commerce, Tammy Everts has seen and helped shaped so much in performance. She's an author, conference stage centrepiece as we...

bit.ly

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