Tammy Everts 🍁

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.

@tammyeverts.com and @csswizardry.com have both written a lot about this, so I don't feel like I need to write another blog post. Read theirs! And set up some alerts in your synthetic monitoring :) www.speedcurve.com/blog/perform... csswizardry.com/2020/01/perf...

Getting web performance prioritized is the hard part. I will talk about this topic on @perfnow.nl. How do you make the case for web performance? → Share your experience in this 3–5-minute survey: pagespeed.one/en/perfnow 🙏 #WebPerf #WebPerformance #PageSpeed

What a honor to be included in latest @speedcurve.com newsletter by @tammyeverts.com! 😍 www.speedcurve.com/newsletter/6...

The core argument from an upcoming piece; something I've come to view as nearly an iron rule in BigCo's: Going from decent to excellent performance is a technical challenge, but moving from poor to decent performance is fundamentally a management and culture problem.

Going fast enough to become "dial tone" changed user behaviour and expectations in a hugely positive way for the product. The "no such thing as too fast until you prove it" lesson is everywhere, and anyone who tells you that you can just add an animation and move on is a danger to your product.

The research done by @tammyeverts.com about rules of thumb for good perf not being universal is on the web only, but I bet my bottom dollar that the same holds for mobile: that if your perf targets, ceiling or floor, are not based on your specific app and user base, you might want to reassess.

Soooo hire me to make your website even faster than you think it needs to be???!

Is the 2.5s LCP that's "good" really ideal for your site? This is a cool look at how you can compare bounce rate with LCP (from Core Web Vitals), to find the spot that's really ideal for your specific site. -> embrace.io/blog/researc...

If you make websites for a living, stop what you're doing and read this research by @tammyeverts.com; it shows what many of us have been saying for a long time: even if there is such a thing as "fast enough", it's generally *much* faster than you are targeting: embrace.io/blog/research-co…

⚡Featured posts this week: ✨ HTML-first site doubled our users: @moh-kohn.eurosky.social ✨ AI Doesn't Write Good Software: @adrianferrera.dev ✨ Web perf measurement is necessary: @tammyeverts.com ✨ Why are we not using Service Workers?: @neciudan.dev 🙏 Special thanks to the authors! #webperf

Mobile teams deserve their Core Web Vitals moment. That’s why Embrace is building Core Mobile Vitals: a rigorous, user-focused framework for understanding mobile app performance through the experiences users actually notice. Read more from @tammyeverts.com: shorturl.at/5A8Ye

Houston, we have a 500 🚨 Join @tammyeverts.com and @cliffcrocker.bsky.social for a live session on how the best engineering teams use synthetic + RUM together. 🗓 April 9 | 10am PT 📍https://shorturl.at/fGM09

I've been fascinated by slime molds for years. When my kids were little, I'd show them slideshows online for fun. (To their credit, they also found them cool.) So here's your slime mold of the day – elaeomyxa ceriferaour – via citizen scientist and author Sarah Lloyd. sarahlloydmyxos.wordpress.com

Videos from our last meetup are now live! Check out the talks by @tammyeverts.com and @paulcalvano.bsky.social ! #webperf www.youtube.com/playlist?lis...

A slow UX affects people’s perception of three important brand elements that are completely unrelated to page speed: content, design, and usability. Here's why that takeaway is relevant in an increasingly competition online landscape 👉 www.speedcurve.com/blog/brand-p... #webperf #ux #pagespeed

Finally got round to publishing my article on implementing faster/better cookie consent banners: lessonsofacto.com/articles/006... It's a lot (>3700 words!) so there's a demo site here: cookie-consent-example.netlify.app and the heavily-commented code is here: github.com/ryantownsend... #webperf

😂 but also 🥳

This is a very good read.

Save the date! 🤩 The next @performanceobserver.dev will be on February 26 at 6:30 PM CET (12:30 PM ET / 9:30 AM PT) All the details and "add to calendar" links in performanceobserver.dev

So excited to be paired with @paulcalvano.bsky.social for this double-header on PerformanceObserver next week! Paul will take a deep dive into the HTTP Archive. Then I'll break down the "performance plateau" – why you need to know it and how to find it. performanceobserver.dev/events/episo...

I ❤️ when #webperf data stops being theoretical and starts speaking language that business understands. This post breaks down how to connect site speed with real outcomes like conversion rate, bounce rate, and revenue. www.speedcurve.com/blog/site-sp...

Many organizations are coming up on performance review season (I'm getting lots of requests for my feedback workshops!) so here's a roundup of my resources on giving _and_ receiving feedback: larahogan.me/resources/fe...

In our rush to align page speed with SEO and business metrics, have we in the #webperf community lost our way? In this post, based on the keynote I gave at #PerfNow a few months ago, I explore how it's not too late to bridge the gap between pragmatism and user delight. www.speedcurve.com/blog/fast/

if you want stable and reliable software, give developers stable and reliable employment

ICYMI, here's a wrap-up of exciting #webperf and #ux highlights from 2025! ⭐ Broad browser support for LCP and INP (W👀T!) ⭐ New metrics & visuals for measuring user happiness ⭐ Deeper metrics for JS diagnostics ⭐ Better budgets = easier regression-fighting www.speedcurve.com/blog/2025-we...

I ❤️ writing these annual wrap-up posts. From broad browser support for key metrics to nuanced metrics for diagnosing issues, 2025 has been filled with huge wins — not just for @speedcurve.com but for our entire #webperf community. Go, us! www.speedcurve.com/blog/2025-we...

IYKYK www.youtube.com/watch?v=BGFt...

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...

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!

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/...

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

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

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

The "i" in "iPhone" stands for "inequality", late 2025 edition:

#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...

⚡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

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...

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! 😀

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...

ALSO, hat tip to the Vancouver airport for displaying works by local artists. This piece made my day. #YVR

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.

I know everyone has been avidly following my progress home from #PerfNow </self-deprecating sarcasm> 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!

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!

performance.now() 2026 will take place on 19th and 20th of November 2026. #perfnow.

This was intensely good in person, and the slides are worth your time.

If you are looking for the slides from my PerfNow 2025 talk, Web Performance Allies, they are at speakerdeck.com/ethangardner...

Making Sense of Long Animation Frames… The slides from my #PerfNow talk are available on Notist noti.st/andydavies/9...

When the person who walks your dog is really into Halloween…

This screencap from It’s Always Sunny will never not make me laugh out loud. Thanks @webx.bsky.social! #PerfNow #IYKYK