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Mark Zeman

@markzeman.com
995 followers 67 following 20 posts

Founder @speedcurve.com, Hopeful idealist

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Reposted by Mark Zeman
Tammy Everts 🍁 @tammyeverts.com · 12/08/2025
"How fast is fast enough?" If you've ever asked this question, then you might want to join tomorrow's SPDY STREAM! Henri and I will be chatting about how to answer that question, among other things. See you there at 10am PDT / 1pm EDT!
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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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Mark Zeman @markzeman.com · 16/05/2025
I want all my web performance metrics described with baking analogies. Who knew that cake had "Frontend" time. Although that would mean that a cake's Time To First Bite (Backend) would come after Frontend!
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Mark Zeman @markzeman.com · 15/05/2025
A company should exist to enrich and support us as individuals. Not for us to enrich it. It’s nothing without its fabulous people.
linkedin.com
Eight years at SpeedCurve! What the WHAT?!?
On the eve of my eighth (!!!) anniversary as a SpeedCurver, I wrote up this ode to the biggest little company I've ever had the privilege to be part of.
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Mark Zeman @markzeman.com · 08/05/2025
This is amazing… vimeo.com/1019210228
vimeo.com
Yeah The Boys - Short Film
Yeah the Boys follows six young Australian men as they sink beers over an afternoon and well into the night. Emoting only through movement; lewd gestures, chokeholds,…
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Reposted by Mark Zeman
Tammy Everts 🍁 @tammyeverts.com · 24/04/2025
Ever wondered why your business and engagement metrics didn't improve after you sped up your pages? You need correlation charts. 👍 Validate your #webperf & #UX metrics 👍 Identify your site's "performance plateau" 👍 Spot performance-blocking trends on your pages 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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Mark Zeman @markzeman.com · 12/03/2025
There is also a 4th, slightly more controversial optimisation trick for SPAs as well.
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Mark Zeman @markzeman.com · 20/02/2025
Love them or not, you’ve got to be up to speed on Core Web Vitals.
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Tammy Everts 🍁 @tammyeverts.com · 16/12/2024
Hey gang! This month's performance hero is a man who needs no introduction. (I've always wanted to say that.) Join us in celebrating the OG #webperf hero: @patmeenan.com! www.speedcurve.com/blog/web-per...
speedcurve.com
SpeedCurve | Performance Hero: Pat Meenan
Celebrating everything that OG performance hero Pat Meenan has done, and continues to do, for the web performance community.
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Mark Zeman @markzeman.com · 16/12/2024
Would love to see the Web Almanac talk more about Safari's lack of perf metrics next year. There's a huge chunk of traffic not being looked at or analysed. There's zero mention of this missing context. almanac.httparchive.org/en/2024/perf...
almanac.httparchive.org
Performance | 2024 | The Web Almanac by HTTP Archive
Performance chapter of the 2024 Web Almanac covering Core Web Vitals, with deep dives into the Largest Contentful Paint, Cumulative Layout Shift, and Interaction to Next Paint metrics and their diagno...
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Reposted by Mark Zeman
Tammy Everts 🍁 @tammyeverts.com · 05/12/2024
I just had a good chat with a @speedcurve.com customer who wanted to know why their CrUX numbers didn't match their RUM numbers. It was a good reminder that even experienced #webperf / #ux folks might not realize that CrUX isn't full RUM. Helpful explainer: support.speedcurve.com/docs/speedcu...
A graphic showing the following list of bulleted text:
CrUX is not the same as RUM.
CrUX is only collected from Chrome browsers, while RUM looks gathers data from all browsers. (This is a huge factor.)
Sample sizes are probably different.
Data aggregation is probably different.
CrUX data is rolled up monthly, while your RUM time period can vary depending on how you're looking at your data.
You may be comparing substantially different dimensions/cohorts
CrUX only segments a site by origin, while RUM allows for deeper segmentation.
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Mark Zeman @markzeman.com · 27/11/2024
Super excited to see this bike packing build come together. Will be riding the Sounds to Sounds in March. www.touraotearoa.nz/p/sound-to-s...
Half built Viral Wanderer bike.
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Mark Zeman @markzeman.com · 25/11/2024
As a dyslexic, not being able to edit posts on BlueSky is a bit rough. 😢
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Joan León @nucliweb.net · 25/11/2024
I love my new @speedcurve.com #perfhero sticker 🥰
Photo of part of my cover laptop with stickers
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Mark Zeman @markzeman.com · 25/11/2024
Web font subsetting with Unicode ranges is such an awesome and under appreciated feature.
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Mark Zeman @markzeman.com · 22/11/2024
Amazing to see Element/Container Timing gathering steam. These are fundamental for truly connecting web performance and user experience. Huge thank you to @jasew.bsky.social and @yoav.ws for pushing these along.
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Nicole Sullivan @nicolesullivan.bsky.social · 20/11/2024
Would you want core web vitals In Safari? Can you help me understand how you would use them and why numbers in one browser isn’t enough? (These may sound like silly questions, but I’d love to understand *your* specific context and use cases)
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SpeedCurve @speedcurve.com · 19/11/2024
Hi, we're so happy to be here! Meet our small but mighty team: www.speedcurve.com/about/ Andy Biggs Cliff Crocker @cliffcrocker.bsky.social Andy Davies @andydavies.me Tammy Everts @tammyeverts.bsky.social Elena Kay Steve Souders Joseph Wynn @josephwynn.bsky.social Mark Zeman @markzeman.bsky.social
speedcurve.com
SpeedCurve | About The Team
We aim to make the internet faster for everyone. SpeedCurve focuses on measuring the design & performance of websites to help you deliver an enjoyable and fast experience to your users.
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Andy Bell @bell.bz · 15/11/2024
4 panels of images. Top left is a dude hugging a dog, captioned "Developers". The dog is captioned "Developer Experience". There's a sad looking cat in the background.

In the third panel there's a zoomed shot of the cat, labelled "Users trying to load the website you built"
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Tammy Everts 🍁 @tammyeverts.com · 15/11/2024
YES! Core Web Vitals are an awesome starting point, but they’re not the final destination. @tkadlec.bsky.social at #PerfNow
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Mark Zeman @markzeman.com · 14/11/2024
Thanks for the notes Stuart! I wasn’t able to make it this year. PPK puts an awesome conference together.
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Tammy Everts 🍁 @tammyeverts.com · 14/11/2024
Per @slightlyoff.bsky.social’s #perfnow talk… GOV.UK publishes great performance case studies on their tech blog. This is one of them. technology.blog.gov.uk/2020/07/02/s...
technology.blog.gov.uk
Speeding up GOV.UK with HTTP/2
We’ve enabled HTTP/2 on GOV.UK to help improve the site’s performance. Here we look at what HTTP/2 is, how it improves performance, and the impact it has had on our users.
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Nic Jansma @nicj.net · 14/11/2024
Took 2 mins at #PerfNow to talk about the RUM Community Group in W3C for anyone doing RUM. It's free and easy to join if you're interested! www.w3.org/community/ru...
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Phil Hawksworth @philhawksworth.dev · 13/11/2024
Very inspired by stories from participants of the Women Coding Community at #halfstackconf. Lots of cross-training and activating. A program that offers resumé clinics, interview coaching, coding clubs, career clubs, speaking clubs, mentoring programs, and much more. womencodingcommunity.com
A speaker supported by 6 more on stage in front of a screen giving a talk
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Harry Roberts @csswizardry.com · 08/11/2024
🫵 I’m looking to add a Flagship client for 2025. You’re an ambitious organisation with a long-term, strategic outlook. You have the desire and capability to be best-in-class, you just need a little guidance. Is that you? We should talk.
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Mark Zeman @markzeman.com · 05/11/2024
"Bernie Sanders older than Trump and Biden, yet he still has all his faculties."
youtu.be
As this presidential campaign comes to an end, let me say a few words
YouTube video by Bernie Sanders
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Mark Zeman @markzeman.com · 07/11/2023
#perfnow was super invigorating. Here are my Pushing Pixels slides loaded with Midjourney goodness. See you all next year. noti.st/zeman/U2Xtyt...
noti.st
Pushing Pixels by Mark Zeman
Often, when building websites, our units of measure are “pages”. It’s time to get more granular! Not every pixel on a page has the same importance. Users want to see the most important content f...
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