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PerformanceObserver

@performanceobserver.dev

A virtual meetup for the web performance community https://performanceobserver.dev/

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24.01.2025
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Latest posts by PerformanceObserver @performanceobserver.dev

Save the date! 🀩

The next @performanceobserver.dev will be on February 26
at 6:30 PM CET (12:30 PM ET / 9:30 AM PT)

All the details and "add to calendar" links in performanceobserver.dev

19.02.2026 21:31 πŸ‘ 2 πŸ” 3 πŸ’¬ 0 πŸ“Œ 1

Join us in a few hours! All details on the website...

26.02.2026 15:44 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Episode 9 | PerformanceObserver - YouTube In this episode, Robin Marx will explain how TTFB isn't what you think it is, and Morgan Murrah will dig into the compositor.

Videos from our meetup yesterday are now live!

www.youtube.com/playlist?lis...

#webperf

29.01.2026 21:39 πŸ‘ 3 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

Reminder - this is later today!

28.01.2026 15:13 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Preview
PerformanceObserver: A virtual web perf meetup Join the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

Happy New Year, folks! The next PerformanceObserver will be in a few weeks on Jan 28 featuring Morgan Murrah and Robin Marx (@programmingart.bsky.social) !

Join us live for access to chat and Q&A - all details and add to calendar at:
performanceobserver.dev

#webperf

13.01.2026 15:35 πŸ‘ 5 πŸ” 2 πŸ’¬ 0 πŸ“Œ 1
Preview
Episode 8 | PerformanceObserver - YouTube In this episode, Aaron T. Grogg will explain how to reduce JS Workload with No or Lo JS. Then, Matt Zeunert walks us through Synthetic Web Performance testin...

The videos of our meetup today are now live on our YouTube channel!
cc @aarontgrogg.com @mattzeunert.com

#webperf

www.youtube.com/playlist?lis...

19.11.2025 20:08 πŸ‘ 3 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

Reminder: our next meetup is this Wednesday! Join live for access to Q&A and general chat!

#webperf

17.11.2025 16:12 πŸ‘ 2 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
Preview
PerformanceObserver: A virtual web perf meetup Join the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

Episode 8 is next week on Nov 19! Come join us live for access to Q&A and general chat!

We have @aarontgrogg.bsky.social talking about reducing JS workload and @mattzeunert.com walking through synthetic testing with DebugBear! #webperf

All details and add-to-calendar at performanceobserver.dev

10.11.2025 18:49 πŸ‘ 3 πŸ” 2 πŸ’¬ 0 πŸ“Œ 1
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Contribute Passionate about a topic? Working on a new tool? Have a technique you want to teach? Research you've done? Tell the web performance community! Send your articles to ssttoo@ymail.com. Please include: ...

Fellow #perfnow fellows, a reminder that PerfPlanet calendar is coming this December for another edition. And it needs YOU. Please ask if you have any contribution ideas or concerns calendar.perfplanet.com/contribute/

30.10.2025 16:59 πŸ‘ 23 πŸ” 19 πŸ’¬ 2 πŸ“Œ 0
Fabulous fallbacks and further font fantasmagoria with Stoyan Stefanov | PerformanceObserver
Fabulous fallbacks and further font fantasmagoria with Stoyan Stefanov | PerformanceObserver YouTube video by PerformanceObserver

Stoyan's video from his talk about fonts and layout shifts is now live!
cc @stoyan.me
#webperf
www.youtube.com/watch?v=WaY8...

24.10.2025 17:10 πŸ‘ 4 πŸ” 1 πŸ’¬ 0 πŸ“Œ 1
Preview
Ep. 7: Font fallbacks and layout shift | PerformanceObserver In this episode, we have Stoyan walking us through font fallbacks and optimizing layout shift.

Join is in approx 74 minutes! @stoyan.me will talk about fonts then we'll probably do some live optimization which will not be recorded
#webperf
performanceobserver.dev/events/episo...

23.10.2025 14:45 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Preview
PerformanceObserver: A virtual web perf meetup Join the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

Episode 7 is next week on Oct 23! Come join us live for access to Q&A and general chat!

We have @stoyan.me talking about font fallbacks and layout shift plus some extra time for an open discussion!

All details and add-to-calendar at performanceobserver.dev

14.10.2025 19:04 πŸ‘ 5 πŸ” 2 πŸ’¬ 0 πŸ“Œ 1
Preview
Episode 6 | PerformanceObserver - YouTube In this episode, Tim Vereecke introduces us to UNO, the missing link in any TTFB analysis. Then, Julian Jandl walks us through a case study on how to overcom...

The videos from our last meetup are now live!

In this episode, Tim Vereecke introduces us to UNO, the missing link in any TTFB analysis. Then, Julian Jandl walks us through a case study on how to overcome third-party challenges in large enterprises using Partytown.

www.youtube.com/playlist?lis...

18.09.2025 16:12 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Call for speakers | PerformanceObserver Come speak at the PerformanceObserver virtual performance meetup! Speakers of all experience levels welcome.

Hey folks, I'm looking to schedule the next PerformanceObserver meetup and need some new CFP submissions.

I have a few experienced #webperf speakers on there, but I like to break it up with either newer speakers or new-to-webperf speakers.

performanceobserver.dev/call-for-pap...

04.09.2025 18:57 πŸ‘ 9 πŸ” 8 πŸ’¬ 0 πŸ“Œ 0
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PerformanceObserver: A virtual web perf meetup Join the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

Episode 6 will be September 16!

In this episode, @timvereecke.bsky.social introduces us to UNO, the missing link in any TTFB analysis. Then, Julian Jandl walks us through a case study on how to overcome third-party challenges in large enterprises using Partytown.

#webperf

performanceobserver.dev

04.09.2025 15:31 πŸ‘ 4 πŸ” 1 πŸ’¬ 0 πŸ“Œ 1
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Episode 5 | PerformanceObserver - YouTube In this episode we have Amrik Malhans walking us through the critical rendering path, and Sia Karamalegos introducing us to using the public web performance ...

The videos from Episode 5 are now live!

#webperf

www.youtube.com/playlist?lis...

18.06.2025 18:04 πŸ‘ 5 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Preview
PerformanceObserver: A virtual web perf meetup Join the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

We're live in 1 hour!

In this episode we have Amrik Malhans walking us through the critical rendering path, and @sia.codes introducing us to using the public web performance data sets of HTTP Archive and CrUX.

performanceobserver.dev

18.06.2025 14:59 πŸ‘ 4 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

Just a little over 24 hours away! Come join us!

17.06.2025 14:28 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 1

The posted time was briefly incorrect, but it's fixed now!

04.06.2025 15:48 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
PerformanceObserver: A virtual web perf meetup Join the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

Ep. 4 will be on June 18!

We will have Amrik Malhans walking us through the critical rendering path, and Sia Karamalegos introducing us to using the public web performance data sets of HTTP Archive and CrUX. #webperf

All details and sign up at performanceobserver.dev

04.06.2025 15:34 πŸ‘ 4 πŸ” 3 πŸ’¬ 1 πŸ“Œ 1
Preview
Episode 4 | PerformanceObserver - YouTube In this episode we have Medhat Dawoud walking us through the process of building fast websites for everyone, and Amila Welihinda explaining how to profile Ja...

The videos from Episode 4 are now live!

cc @medhat.dev #webperf

www.youtube.com/playlist?lis...

20.05.2025 14:08 πŸ‘ 4 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

Reminder - this is tomorrow!

13.05.2025 14:25 πŸ‘ 3 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Preview
PerformanceObserver: A virtual web perf meetup Join the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

Ep. 3 will be on May 14!

We will have Medhat Dawoud walking us through the process of building fast websites for everyone, and Amila Welihinda explaining how to profile JavaScript in production. #webperf

Details at performanceobserver.dev

30.04.2025 14:41 πŸ‘ 2 πŸ” 2 πŸ’¬ 0 πŸ“Œ 1
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Episode 3 | PerformanceObserver - YouTube In this episode we have Andrea Verlicchi walking us through some real-world case studies of optimizing INP, and Ethan Gardner will discuss how to make allies...

The videos from our latest episode are up! Come catch a pair of great talks by @verlok.bsky.social and @ethangardner.com!

www.youtube.com/playlist?lis...

#webperf

17.04.2025 15:16 πŸ‘ 4 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0
Preview
PerformanceObserver: A virtual web perf meetup Join the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

Reminder - PerformanceObserver is tomorrow! Take a break from the news and listen to @ethangardner.com and @verlok.bsky.social talk about #webperf

All details and add to calendar at
performanceobserver.dev

15.04.2025 13:34 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

It was so much fun recording this talk! Thanks for having me @performanceobserver.dev !!

20.03.2025 20:27 πŸ‘ 7 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0

Thanks for speaking! We know it's a lot of work. ❀️

27.03.2025 12:49 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
PerformanceObserver: A virtual web perf meetup Join the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

Hey folks, the next episode of PerformanceObserver is now scheduled for 16 April with @verlok.bsky.social and @ethangardner.com ! See all details at performanceobserver.dev including add to calendar links with the join instructions.

#webperf

27.03.2025 12:49 πŸ‘ 7 πŸ” 6 πŸ’¬ 0 πŸ“Œ 0
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Episode 2 | PerformanceObserver - YouTube

πŸŽ₯ The videos from our last meetup are now live on our YouTube channel! Here's the playlist:
www.youtube.com/playlist?lis...

Big thanks to @keerthanak17.bsky.social and @webx.bsky.social for speaking! ❀️

#webperf

20.03.2025 14:59 πŸ‘ 5 πŸ” 2 πŸ’¬ 0 πŸ“Œ 1
Preview
PerformanceObserver: A virtual web perf meetup Join the PerformanceObserver virtual performance meetup to get all the latest web performance news and hang out with the community.

Hey folks, here’s your reminder that PerformanceObserver is back with our second episode tomorrow! @webx.bsky.social s and @keerthanak17.bsky.social will talk about LoAF and designing for bad performance. All details and add to calendar at performanceobserver.dev

#webperf

18.03.2025 13:49 πŸ‘ 6 πŸ” 5 πŸ’¬ 0 πŸ“Œ 0