Sergey Chernyshev

I learned that word in college and understood (to a degree) after 10-15 years later.

What new web features are your users actually ready for? Stop guessing. 🔮

Baseline helps you make data-driven decisions so you can ship the right features at the right time. Learn more and find your target with #WhatsMyBaseline → goo.gle/whats-my-baseline

Want to feel the exciting rush of speed? Optimize your website!

Yep, who said that dictators can count the number of “b”s in blueberry?

Some people get mad whenever I say it but most people are followers and they deeply desire to be led.

I'll be chatting tomorrow with @henrihelvetica.bsky.social and other Rock stars about web performance and RUM. Tune in.

Want to build faster websites? Here's how:

- Learn how browsers parse, layout & paint
- Treat JS as a tool, not the foundation(!)
- Favor static HTML or server side rendering at all times
- Use Core Web Vitals alongside other metrics to learn shortfalls, improve and iterate

Then keep doing that.

Wait till AI will start helping you optimize your git history ;)

People keep telling me that paying 10x+ for React or Angular vs a contemporary tool like Fast, Lit, Svelte, Preact, Qwik, or Solid (etc. etc.) is fine because "it's only 50K."

And I hear that, but by the third or fourth React version on the page, I really start to wonder.

Screenshot showing part of the Chrome DevTools Performance tab In the images there's four custom tracks - LoAFs, Long Tasks, Soft Navigations and Interactions Contentful Paint The highlighted Soft Navigation took 4.03s

Been playing with Chrome's experimental support for measuring soft-navigations / route changes

Think there's a few people in for a rude awakening when we can really measure SPA performance in the wild

Are you curious how browsers work? I'm working up a list of essential web performance resources, and many of the talks from this 2020 instance of Chromium University ("internal" training for Chromies) are incredible:

code.sgo.to/2020/12/16/chrom…

SpeedCurve | Why you need to know your site's performance plateau (and how to find it) Have you ever wondered why your site got faster, but your business and user engagement metrics didn't change? Here's why.

This essential post by @tammyeverts.com chimes with my experiences; teams I talk with don't understand that there are huge gains to be had when they finally get perf under thresholds that they think of as "impossible" with today's JS-laden stacks:

speedcurve.com/blog/web-perform…

The truth about all the time spent solving leetcode problems.

Thank you for telling the world and please accept my condolences, Katie!

I own the regular-sized one, not a small one. Still have a couple buttons empty on my stream. Pages are only good for switching between modes, but you’d probably want everything for stream on the same page. That being said, it was a gift from my kids so I didn’t make a buying decision on it ;)

Very well deserved, @csswizardry.com! Congratulations!

A blue book cover. The title of the book is Time is Money: The Business Value of Web Performance". The author is Tammy Everts.

When you write a tech book, you don't do it for 💰💰. You do it to share a topic you're passionate about.

When I get a royalty for my book, I don't think "Time to go shopping!" I think "Folks want to learn about one of my favourite topics!"

If you've read my book, thank you! I'd love your feedback!

Debugging is 80% of coding.

Once you accept that, everything gets easier.

Congratulations on the acquisition! Hope you’ll all continue the openness of Nuxt ecosystem!

Screenshot of LinkedIn skeleton page, not rendering because device is on a 3G connection.

Ah… 3G my old friend. (Posted after returning to LTE territory.)

Happy birthday, Harry!

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.

performance.now(), the web performance conference, 30th and 31st of October, Amsterdam. Single track, the best speakers in the industry, plenty of your performance-mad peers around to have fascinating conversations. What's not to like? Let's introduce our speakers ...
perfnow.nl

I usually wake up because I break something and can’t fix. Last night I left my carry-on luggage on the plane during the transfer. Woke up early as I was tired of un$&#ing the situation.

YouTube video by Web Conferences Amsterdam Form control styling - Tim Nguyen - CSS Day 2025

If you code websites, then you KNOW how it’s been to style form controls.

Watch this #cssday talk from @ntim.bsky.social to learn why it’s been so hard, and how we are going to fix it for the future.

www.youtube.com/watch?v=WgSi...

#css #webdev #formcontrols

As they say - it felt like a good idea at the time.

it feels important to keep saying: SPA as an app framework default (and not an opt-in feature) was a mistake

@perfnow.nl is for any perfhead, enthusiast or anyone into deep technical discussions THE event to go to! Come hang out with us! This year we have a really stacked lineup, and also there's me 😁!

Firefox shipping scheduler.postTask() and scheduler.yield() for all your long task-avoiding scheduling needs!!

You don’t - they do. They sell cheap, unqualified traffic to unsuspecting customers (whatever it is their boss or another customer).

They are willing to bamboozle anyone who has a blog to do it.

Just ignore the idiots/scammers.