Tammy Everts 🍁
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tammyeverts.com
Tammy Everts 🍁
@tammyeverts.com
2.2K followers 330 following 360 posts
I contain multitudes, but for brevity: reader, writer, speaker, baker, quilter, yoga-er, mom-joke teller, lover of lakes and mountains.

🫶 Building #UX / #webperf / #o11y community at @embrace.io (which acquired @speedcurve.com)
🫶 Co-chair of @perfnow.nl
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tammyeverts.com
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.
Reposted by Tammy Everts 🍁
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 Tammy Everts 🍁
scopicengineer.com
It's been almost three years, but CrystalCon, the accessibility conference created from spite, is back. This January, I'm giving you six sessions of content over two days, all made by me. Given the current state of tech and digital accessibility, most sessions will focus on artificial intelligence.
Many identical robots are working at laptops, looking down. Three of the robots are without computers and instead are looking straight ahead. Text: CrystalCon January 2026. Artificial Intelligence Natural Consequences
November 20, 2025 at 8:48 PM
tammyeverts.com
Thanks to all who joined me and @seancdavis.com for our #PixelPalooza fireside chat about how image optimization (and lack thereof) affects your users and your business! And thanks to @remotesynthesis.com for inviting me!

I put together some interesting stats here: speakerdeck.com/tammyeverts/...
The Hidden Cost of Media on the Web [PixelPalooza 2025]
Images, video, audio and other media are a big part of what brings the web to life and visitors have come to expect a multimedia experience across the w…
speakerdeck.com
November 20, 2025 at 9:11 PM
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
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
tammyeverts.com
If your backend times are slow, that hurts all your other key performance and UX metrics, including Core Web Vitals!

Find out how to track your CDN's health and get backend transparency — along with 24 more holiday readiness tips!

#corewebvitals #webperf #ux #sitespeed #pagespeed
speedcurve.com SpeedCurve @speedcurve.com · 6d
🎄 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 7:35 PM
Reposted by Tammy Everts 🍁
infrequently.org
The "i" in "iPhone" stands for "inequality", late 2025 edition:
Worldwide smartphone shipments by year in millions; sources: IDC, Statista, and Counterpoint Research. At no point in the past decade have iPhones broken the 20% annual sales barrier. iOS is overrepresented in traffic statistics owing to wealth-correlated effects; e.g., faster networks and devices inducing heavier internet use. This does not imply that users on slower devices do not have money to spend, only that they are poorly served by the contemporary web. Average selling prices in nominal USD for iOS (~$1000) and Android devices (~$300) vs. worldwide smartphone Average Selling Price (~$360). iPhones aren't real life. Time series of single-core Geekbench 6 scores for 4 device classes: fastest iPhone, fastest Android, mid-range Android, and low-end device (~$100). The Performance Inequality Gap is growing, year on year, and the lower tiers are not even on the same trend line, let alone catching up.
November 18, 2025 at 3:51 AM
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 Tammy Everts 🍁
webperfreport.bsky.social
⚡Featured posts this week:
✨ AI assistance for performance: @matthiasrohmer.bsky.social
✨ The Web Animation Performance: @citizenofnowhe.re
✨ How Fast Is Fast Enough?: @tammyeverts.com
✨ Performance is about people: @markzeman.com
🙏 Special thanks to the authors!
#webperf
⚡Featured posts this week from Perf Links by WebPerformance Report:
November 16, 2025 at 2:15 PM
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
tammyeverts.com
We're joining forces with @embrace.io!

Together we'll give you visibility into how users experience your site and your app, so you can create fast, seamless experiences everywhere! AND you'll be able to tie this back to user engagement and business metrics.

Stoked about this huge next step! 😀
speedcurve.com SpeedCurve @speedcurve.com · 12d
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 11:09 PM
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
tammyeverts.com
ALSO, hat tip to the Vancouver airport for displaying works by local artists. This piece made my day. #YVR
Sculpture by Canadian artist Elaine Brewer-White of a large grizzly bear gently cradling Deadpool. Title card for sculpture by Canadian artist Elaine Brewer-White of a large grizzly bear gently cradling Deadpool. The piece is called “Heroes come in many forms”. The piece is meant to celebrate Canadian actor Ryan Reynolds’s environmental activism.
November 2, 2025 at 4:45 PM
tammyeverts.com
Also, I hope I’m never too old to get excited like a weird nerdy little kid about waking up at an airport hotel with this view of the tarmac.
Photo of the tarmac at the Vancouver airport, taken from a hotel room window.
November 2, 2025 at 4:41 PM
tammyeverts.com
I know everyone has been avidly following my progress home from #PerfNow so I’m happy to say that after 29.5 hours in airports and planes, only 2 more hours till I arrive home! 🎉 🎉 🎉

And yes, if you’re wondering, the long haul in both directions is totally worth it!
November 2, 2025 at 4:38 PM
tammyeverts.com
Another #PerfNow is over, and I’m already looking forward to next year. Thank you so much to…

❤️ @ppkoch.bsky.social for organizing this amazing event

❤️ @tkadlec.bsky.social & @csswizardry.com for being such delightful co-chairs

❤️ Everyone who attends and brings such wonderful energy!
A rainbow over Amsterdam.
November 1, 2025 at 9:31 AM
Reposted by Tammy Everts 🍁
perfnow.nl
performance.now() 2026 will take place on 19th and 20th of November 2026. #perfnow.
November 1, 2025 at 8:21 AM
Reposted by Tammy Everts 🍁
infrequently.org
This was intensely good in person, and the slides are worth your time.
November 1, 2025 at 9:05 AM
Reposted by Tammy Everts 🍁
ethangardner.com
If you are looking for the slides from my PerfNow 2025 talk, Web Performance Allies, they are at speakerdeck.com/ethangardner...
Web Performance Allies - PerfNow 2025
Image credits: https://commons.wikimedia.org/wiki/File:TAR_Detour_clue.png https://commons.wikimedia.org/wiki/File:Carach_Angren_M%C3%A9an_22_08_200&hellip;
speakerdeck.com
October 31, 2025 at 3:17 PM
Reposted by Tammy Everts 🍁
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
tammyeverts.com
When the person who walks your dog is really into Halloween…
A pretty white dog dressed up for Halloween, wearing a black witch’s hat and a purple tutu.
October 31, 2025 at 4:14 PM
tammyeverts.com
This screencap from It’s Always Sunny will never not make me laugh out loud. Thanks @webx.bsky.social!

#PerfNow #IYKYK
Classic image of Charlie from the tv show It’s Always Sunny in Philadelphia standing in front of a whiteboard covered in conspiracy theory scribbling.
October 31, 2025 at 3:09 PM
Reposted by Tammy Everts 🍁
henrihelvetica.bsky.social
In fact, many past guests are at @perfnow.nl conference right.(now):
@webx.bsky.social (now on stage)
@kurtextrem.de
@tammyeverts.com
@timvereecke.bsky.social
@programmingart.bsky.social
@cliffcrocker.bsky.social
@karlijnlowik.bsky.social
+ more. Link below:

🎥 bit.ly/spdy-streams

#perfNow
headline that reads SPDY STREAM, with cover art work of podcasts.
October 31, 2025 at 2:50 PM
tammyeverts.com
Interesting! Etsy implemented speculation rules and got these results:

👍 Time to First Byte on the listing page improved 23.6%
👍 First Contentful Paint improved 20.7%
👍 Largest Contentful Paint improved 21.1%
👍 DOMContentLoaded improved 20.4%

#PerfNow #webperf

www.etsy.com/codeascraft/...
www.etsy.com
October 31, 2025 at 2:32 PM
Reposted by Tammy Everts 🍁
henrihelvetica.bsky.social
For those who just watched @tunetheweb.com 's presentation, this is the SPDY STREAM he just posted about w/ @yoav.ws + @krzksz.bsky.social of Shopify. Thank again Barry!
#perfNow

🎥 youtu.be/DHgoULxvuJ8
person on stage during a presentation showing a slide that reads SPDY STREAM.
October 31, 2025 at 2:15 PM