iiinova — where your digital self keeps evolving

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Tammy Everts 🍁 @tammyeverts.com · 19/02/2026

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...

performanceobserver.dev

Querying the HTTP Archive and finding your Performance Plateau | PerformanceObserver

In this episode, Paul Calvano dives deep into querying the HTTP Archive dataset to uncover web trends, while Tammy Everts breaks down the "Performance Plateau", explaining why identifying your specifi...

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Tammy Everts 🍁 @tammyeverts.com · 17/02/2026

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/

speedcurve.com

SpeedCurve | How fast is fast enough? Rethinking web performance in pragmagical terms

Always remember: We're in the business of creating experiences for other humans.

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SpeedCurve @speedcurve.com · 12/01/2026

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...

speedcurve.com

SpeedCurve | 2025 was a big year! Here are some highlights...

From broad browser support for key metrics to nuanced metrics for diagnosing issues, 2025 has been filled with wins.

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Tammy Everts 🍁 @tammyeverts.com · 18/12/2025

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...

speedcurve.com

SpeedCurve | 2025 was a big year! Here are some highlights...

From broad browser support for key metrics to nuanced metrics for diagnosing issues, 2025 has been filled with wins.

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Tammy Everts 🍁 @tammyeverts.com · 25/11/2025

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.

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Embrace @embrace.io · 24/11/2025

🚨 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

ow.ly

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.

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SpeedCurve @speedcurve.com · 24/11/2025

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!

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Tammy Everts 🍁 @tammyeverts.com · 20/11/2025

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.

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Tammy Everts 🍁 @tammyeverts.com · 19/11/2025

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

speedcurve.com

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.

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SpeedCurve @speedcurve.com · 18/11/2025

🎄 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.com

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!

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Tammy Everts 🍁 @tammyeverts.com · 17/11/2025

#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...

cfe.dev

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.

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Tammy Everts 🍁 @tammyeverts.com · 14/11/2025

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...

conffab.com

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...

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SpeedCurve @speedcurve.com · 12/11/2025

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.

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Tammy Everts 🍁 @tammyeverts.com · 06/11/2025

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.com

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.

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Tammy Everts 🍁 @tammyeverts.com · 30/10/2025

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/...

speakerdeck.com

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…

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Tammy Everts 🍁 @tammyeverts.com · 30/10/2025

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.com

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?

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Tammy Everts 🍁 @tammyeverts.com · 30/10/2025

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.com

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.

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SpeedCurve @speedcurve.com · 22/10/2025

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."

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Tammy Everts 🍁 @tammyeverts.com · 09/10/2025

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.com

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?

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Tammy Everts 🍁 @tammyeverts.com · 08/10/2025

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.com

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.

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SpeedCurve @speedcurve.com · 07/10/2025

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 · 01/10/2025

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

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.

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Tammy Everts 🍁 @tammyeverts.com · 15/09/2025

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

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Tammy Everts 🍁 @tammyeverts.com · 30/09/2025

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.com

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?

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performance.now() conference @perfnow.nl · 30/09/2025

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.

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Harry Roberts @csswizardry.com · 20/09/2025

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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SpeedCurve @speedcurve.com · 22/09/2025

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...

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SpeedCurve @speedcurve.com · 17/09/2025

🔥 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...

speedcurve.com

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.

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SpeedCurve @speedcurve.com · 16/09/2025

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...

speedcurve.com

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.

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performance.now() conference @perfnow.nl · 15/09/2025

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...

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.

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Sia Karamalegos @sia.codes · 18/08/2025

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/

sia.codes

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.

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Harry Roberts @csswizardry.com · 02/09/2025

🩺 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/...

csswizardry.com

Obs.js – context-aware web performance for everyone

Obs.js reads device and network signals and allows you to build adaptive user experiences.

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Tammy Everts 🍁 @tammyeverts.com · 02/09/2025

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 · 19/08/2025

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!)

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SpeedCurve @speedcurve.com · 19/08/2025

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 · 19/08/2025

"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.com

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.

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Harry Roberts @csswizardry.com · 19/08/2025

I used this to build a quick obfuscator. This will be great for anonymising @speedcurve.com dashboards before putting them in talks etc. Peep the address bar and tab name, too!

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Tammy Everts 🍁 @tammyeverts.com · 18/08/2025

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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Mark Zeman @markzeman.com · 16/07/2025

Loving the shift away from bloated client-side JavaScript. With RUM tools offering better visibility into the impact of JS, the DX vs. UX trade-off is becoming harder to ignore. Any UX focused changes in your stack making it to production? Did your numbers improve? www.speedcurve.com/blog/long-an...

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Tammy Everts 🍁 @tammyeverts.com · 13/08/2025

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?

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Henri Helvetica 🧑🏾‍🚀🇭🇹 @henrihelvetica.bsky.social · 12/08/2025

✨ 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

bit.ly

✨ 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...

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Harry Roberts @csswizardry.com · 06/08/2025

Same code, same infrastructure, different context. Web performance is sometimes an ‘us thing’ and sometimes a ‘them thing’. For better or worse, we have a responsibility to cater to both.

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Tammy Everts 🍁 @tammyeverts.com · 01/08/2025

Holy moly... our Speed Matters newsletter has gained 1K new subscribers in the past month! The summer edition goes out next week. It's not too late to sign up and join our 18K subscribers! Browse the archive and sign up here: www.speedcurve.com/newsletter/ (We won't spam you, I promise.)

speedcurve.com

SpeedCurve | Speed Matters Newsletter

Get great performance content – no filler! – delivered to your inbox every month.

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