Sergey Chernyshev

Interested in setting aside the magical prompter and learning some web standards skills the old fashioned way? You can sign up for my online Web Components course for free until Oct 31 with the code markitzero. If you find it useful, please consider letting folks know! 🎃

Are you or your company working on anything related to OAuth/OIDC or building anything that needs trust & safety (moderation)? If so you can currently hire me: emelia@brandedcode.com I'm a freelancer on US eastern time. #oauth #oidc #hireme

The number of connection address and protocol combinations keeps growing, and every browser behaves differently. With Happy Eyeballs v3 browsers will fall back to a working option faster and more safely. This session will show what its performance impact looks like. Max Inden at perfnow.nl

Sometimes custom solutions that we build highlight deeper challenges with performance and usability, and reveal an opportunity to grow the web’s native capabilities. How doe you move from patterns that work on one website to features that are built into our browsers? @scottjehl.com at perfnow.nl

Visual history of my drawleather.com side-project codebase: sergeychernyshev.github.io/drawleather/ - it uses GitTerra, another fun game project that @alexchernyshev.com and I made.

With 2 years of rollouts, we've learned a lot about compression dictionaries and the Web. Patrick will cover what works, where the footguns are, how to maximize their effectiveness, and other experiments around compressing content on the web. @patmeenan.com at perfnow.nl

In this deep-dive session, Tim will use real-world data and performance metrics to show how scalemates.com became the fastest and largest scale modelling website in the world. You’ll leave with practical, actionable insights to push performance even further. @timvereecke.bsky.social at perfnow.nl

The provisional SCHEDULE is live; changes still possible. perfnow.nl/schedule.html

🧪 We've expanded Core Web Vitals to include support for soft navigation (SPA)! Since SPAs are handled differently in implementation, they have required bespoke custom measurement, making it hard to compare directly across sites. Measuring performance is a little art, a little science. 1/2

Chrome 155 adds support for JPEG XL (.jxl) → goo.gle/4yYpSjW Expect 30-50% smaller file sizes than traditional JPEGs, native HDR, progressive rendering, and lossless JPEG transcoding. Under the hood, Chrome uses jxl-rs, a pure Rust decoder built for maximum memory safety and performance.

Informed opinion beats personal preference. @producttalk.bsky.social on why engineers should speak up carefully. Full episode and notes: https://www.epicproduct.engineer/start-with-curiosity-and-talk-to-a-customer-continuous-discovery-with-teresa-torres~hhogx

Awesome write-up! If you’ve been dealing with fonts in your #webperf work and have seen it all, this is something new for you!

Dear friends, please watch this and make sure to not only NOT behave like men described in this talk (I wish we didn’t need to mention that) but also to develop the brain muscle to stand up to such behavior and not be succumbed to the bro culture or whatever drives this behavior - be good people.

I’ve built something like that awhile ago and then tried to build a MENACE learning machine that played tic-tac-toe: en.wikipedia.org/wiki/Matchbo...

I guess I’ll be wrestling my wife for the projector I got for the @folkcomputer.bsky.social setup

Synthetic perf testing was valuable for low-noise dev testing and regression detection but lost favor as RUM metrics improved. With AI, accurate, representative, low-noise lab testing is THE unlock to being able to have an agent hill-climb on perf improvements.

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

Right after cyber and crypto.

At today’s @nywebperf.com’s Meet4SPEED today, @paulcalvano.bsky.social shared an issue he discovered one the site that one of the members brought in that neither he nor I ever seen before! Looking forward to his blog post as some nerd sniping was quite evident ;)

Made a metal rose at The Maker Camp. A lot of metalwork for me this year.

I’ve been long saying that speed is something that needs to be designed. Looking forward to this talk!

⌨️ The Interop 2027 process is moving along, and now is the time for ranking proposals! And blogging about it! https://meyerweb.com/eric/thoughts/2026/10/14/my-interop-2027-rankings/

Proud parent moment, my youngest (6ft+ bearded guy), is doing some metal forging.

I'm super excited to announce that today we've added experimental versions of Core Web Vitals metrics including soft navigations to the Chrome User Experience Report! You can see them in BigQuery, the APIs, and CrUX Vis. Check it out! web.dev/blog/crux-ex...

You know, the thing is, I had drafted this piece a month ago, and then never published it, because I thought maybe it was too mean.

Thanks to @sergeyche.dev, we've also split TCP connection time into separate Connection and TLS negotiation durations for more granularity there too 👏

We now have LCP and INP sub-parts in @cloudflare-dev.bsky.social Real User Monitoring 🎉 This gives you deeper insight into where your websites and web applications are causing frustration for your users, so you can target changes more effectively. developers.cloudflare.com/changelog/po... #webperf

Came back from The Maker Camp and relaxing today. It is highlighted by the fact that my new laser projector arrived and I am annoying it as a lame consumer before I’ll be putting it to good use for a @folkcomputer.bsky.social install or a similar system I want to build code name “Projector OS”.

On Thursday at 6pm the @nywebperf.com meetup is running another in person "Meet for Speed" session. We'll be taking requests from attendees for sites to do a web performance analysis on. Etsy is hosting us at their office in Brooklyn. www.meetup.com/web-performa...

Ok, warmed up and caffeinated in the rest area, time to continue the ride home…

Heading it to The Maker Camp, silencing my computer brain for a weekend. Hope to come back tired and full of new little maker skills.

Watch the story of an open source sheet press for plastic recycling by Precious Plastic project. Watch the video and support them by becoming a member if you're interested in technology itself or want to support plastic recycling community. www.youtube.com/watch?v=KlWk...

We have $100K to give away to open source maintainers! Let us know your suggestions and nominations.

we're meeting again!! on the 19th!! @cozylittle.house will be giving a talk on how to speak about the Atmosphere to the general public @bnb.im will be giving a historical retrospective on Tent (a previous attempt at protocol-based social) and... maybe you? see you there 🙂‍↕️

“every time someone is sleeping on a subway bench in a city, the rest of america can sort of say ‘ugh, look at these cities.’ but we are holding a lot of your people who you failed to love and take care of.” 👏 👏 👏

booking.com cut their SSR costs by 38%. What stood out to me? they’re effectively shipping their org chart. One app per page (home, search, property). Teams own the components (header, footer, reviews), loaded at runtime. Conway’s law, shipped to production.

Get ready for "The Past, Present, and Future of Performance Engineering" with Alexander Podelko on October 22 at 6:00PM! RSVP: nywebperf.com/e/315924656/... #webperformance #nyc #meetup

i'm volunteering at processing community day nyc this saturday, hopefully i'll see a bunch of you's there 🌀

Video from Sufian Rhazi's talk "Speed is a shape (why React is slow)" is up! www.youtube.com/watch?v=A8k9... Subscribe for more! #webperformance #nyc #reactjs

Looking forward to @folkcomputer.bsky.social open house tonight. Ready to be amazed and immerse into physical computing practice and ask a million questions of existing practitioners.

v0.0.191 of Modern Web Guidance is out and it's a big one! *16* new guides covering: web components by @castastrophe.bsky.social Cross-Origin Storage by @tomayac.com security by @rowan.fyi UI and PWA by @jamessw.com and @sturobson.com Wasm by @sbc100.bsky.social github.com/GoogleChrome...

Last few early-ish tickets left. I can't wait to be there and seeing you all!

Just watched the video by @kevinpowell.co about AI impact on our jobs: www.youtube.com/watch?v=1aW7... I feel like many of us might be having "AI burnout" - a new type of burnout that we in software industry didn't see before. The analogy of moving from hand-crafted to conveyor belts seems right.

Not so small step for Bsky, giant leap for mankind/ATproto ;)

This has been in the works for a bit, happy to see BEACON dataset now available in RUM Archive. /cc @paulcalvano.bsky.social

We'd love to welcome @loim.dev to the organizing team as Social Media Manager! 🎉 🎉 🎉 🎉 🎉 If you'll see event announcements on here or other platforms or get our event emails, know that Liam is the one driving these efforts. If you'd like to join the team, reach out here: www.nywebperformance.org

Slides from Sufian Rhazi's "Speed is a shape (why React is slow)" talk: github.com/nywebperf/sp... You can find Sufian at abstract.properties Video coming soon to our YouTube! #webperformance #nyc #reactjs

Is it just me or YouTube is playing at 10x speed or something?

Modern Web Guidance v0.0.187 brings new and updated guides and Codex plugin support → goo.gle/4harAXQ ✨ New guides: progress rings, scrollspy nav menus, loading spinners 📝 Updated guidance to avoid bfcache breakage and unwanted inline layout gaps 🔌 Added plugin manifest support for Codex

Tonight at 6:00PM @ Cloudflare: "Speed is a shape (why React is slow)" with Sufian Rhazi. If you RSVPed, we'll see you there! nywebperf.com/e/315924565/... #webperformance #nyc #reactjs