Web addict. Can't stand slow sites. Organizer of @nywebperf, @GoogleDevExpert, help with #UXSpeed. He / Him. @SergeyChe@WebPerf.social & @SergeyChe.bsky.social
Joined June 2008
- Tweets 12,493
- Following 534
- Followers 1,990
- Likes 12,552
168 Photos and videos
Sergey Chernyshev retweeted
17 Nov 2025
NY Web Performance meetup this Thursday, Nov 20 at 6PM: "Web Components Can’t Save Us. (But You Can!)" with Scott Jehl
Join us at the CloudFlare Office in Manhattan!
We are fully booked, so PLEASE update your RSVPs if you cannot attend! meetup.com/Web-Performance-N…
#webperf #nyc
1
1
244
Sergey Chernyshev retweeted
22 Sep 2025
Slides speakerdeck.com/sergeycherny… from "7 Levels of a Web Performance Journey" talk at NY UX Speed and Web Performance meetup at @Cloudflare NYC last week.
We'll have video posted to our YouTube channel soon, subscribe here to get updates! youtube.com/user/NYWebPerfor… #webperf #nyc
3
5
551
Sergey Chernyshev retweeted
8 Sep 2025
Next Thursday, Sep 18: 7 Levels of a Web Performance Journey with Eric Goldstein, Sergey Chernyshev and Alexander Chernyshev. Join us at the new @Cloudflare NYC office on the 88th floor of the iconic 1 WTC building!
RSVP here: meetup.com/Web-Performance-N… #webperf #wpo #perfmatters
1
1
296
Sergey Chernyshev retweeted
19 Jun 2025
Slides from Akshay Nair's "Performance on a Budget: Lessons from Building a Nonprofit SaaS Platform" talk: github.com/nywebperf/speaker…
We'll also have video posted to our YouTube channel shortly, subscribe here to get updates! youtube.com/user/NYWebPerfor… #webperf #nyc
4
4
344
Sergey Chernyshev retweeted
17 Jun 2025
Tonight at 6:00PM @ Fastly: Performance on a Budget: Lessons from Building a Nonprofit SaaS Platform with Akshay Nair. See you all there: meetup.com/Web-Performance-N… #webperf #nyc
1
4
198
20 Nov 2024
I am usually not here. And now you can also find me at bsky.app/profile/sergeyche.b…
103
Sergey Chernyshev retweeted
10 Oct 2024
For Core Web Vitals what is CLS measured in? Why is 0.1 considered not good and 0.25 bad, and what do those numbers represent?
I've had 3 separate conversations on this with various people in last 24 hours so figured it's time for another deep dive thread to explain...
🧵 1/12
ALT Good CLS values are 0.1 or less. Poor values are greater than 0.25.
2
39
129
19,511
Sergey Chernyshev retweeted
11 Oct 2024
Tonight at 6:00PM @ Fastly NYC: We Love LoAF (and INP) with Karlijn Löwik and @blue2blond
See you all there: meetup.com/Web-Performance-N… #webperf #nyc
1
2
147
Sergey Chernyshev retweeted
8 Oct 2024
This Friday, October 11 at 6:00PM: "We Love LoAF (and INP)" with Karlijn Löwik and @blue2blond of RUMvision. Please update your RSVPs: meetup.com/Web-Performance-N… #webperf #nyc
2
4
164
Sergey Chernyshev retweeted
4 Oct 2024
Next Friday, October 11 at Fastly NYC: We Love LoAF (and INP) with Karlijn Löwik and @blue2blond. RSVP now: meetup.com/Web-Performance-N… #webperf #nyc
1
3
126
Sergey Chernyshev retweeted
16 Sep 2024
Folks… I have some exciting news to share. 🚀
Today I’m starting a new position as Product Lead at @fontawesome!
I wrote a bit more on my blog here: lea.verou.me/blog/2024/aweso…
47
23
562
55,429
Sergey Chernyshev retweeted
17 Sep 2024
Bon matin, @_welovespeed! I’m so excited to be here to talk about how #webperf is not just good for your business — it’s good for your brain. I’m also happy to be representing Team @SpeedCurve. If you want to talk about performance and UX, please come and say hi!
2
8
1,187
Sergey Chernyshev retweeted
17 Sep 2024
This is a BIG change to Chrome DevTools Perf Panel to make it easier to see and reproduce issues BEFORE doing a full trace.
So you can be more confident you’re tracing the right thing.
17 Sep 2024
🔥 Just released in Chrome 129 today, a new Performance panel landing page!
🔹 monitor your local Core Web Vitals in real time
🔹 compare them to real-user data from CrUX
🔹 and more
Learn all about it in today's blog post:
developer.chrome.com/blog/de…
17
64
4,523
Sergey Chernyshev retweeted
18 Sep 2024
Slides drive.google.com/file/d/18z7… from "Behind the scenes of the world's highest-converting checkout" talk by Tanya Nam, Staff Solutions Engineer at Shopify.
We'll have video posted to our YouTube channel shortly, subscribe here to get updates! youtube.com/user/NYWebPerfor…
4
9
411
Sergey Chernyshev retweeted
12 Sep 2024
Tonight at 6:00PM @ Fastly: Behind the scenes of the world's highest-converting checkout with Tanya Nam from Shopify. See you all there: meetup.com/Web-Performance-N… #webperf #nyc
2
3
159
Sergey Chernyshev retweeted
10 Sep 2024
This Thursday, September 12 at 6:00PM: "Behind the scenes of the world's highest-converting checkout" with Tanya Nam from Shopify.
Please update your RSVPs: meetup.com/Web-Performance-N… #webperf #nyc
1
2
99
Sergey Chernyshev retweeted
6 Sep 2024
There will be a meetup the night before @PerfNowConf it's now listed on @perfplanet's events page events.perfplanet.com/ Here is the direct link too lu.ma/z1qt2a63
10
20
2,253
16 Aug 2024
It really has been only 4 years - and CWV became a staple of the conversation and a great start for people's journey to understand Speed of User Experience! Thank you, Google Team for keeping it up!
15 Aug 2024
Was asked by someone* at work today to confirm that the Core Web Vitals REALLY was only 4 years old as seems like much longer.
It's amazing how much they've become part of our shared vocabulary in such a short space of time!!
* Name spared to protect the guilty 😉
3
236
Sergey Chernyshev retweeted
14 Aug 2024
And if you missed it this time around, you can still come to @TheLeadDev Conference in NYC next month and hear me give a similar but also different version of the talk on September 4th! leaddev.com/conferences/seve…
1
2
293
Sergey Chernyshev retweeted
13 Aug 2024
Tonight at 6:00PM @ Fastly: Several Components are Rendering: Client Performance at Slack-Scale with @zeigenvector. See you all there: meetup.com/Web-Performance-N… #webperf #nyc
2
3
345