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Joan León

@nucliweb.net

After three years attending @perfnow.nl in person — the leading conference in the Web Performance community — this year I’ll be joining online.

Huge thanks to the organizers for building such an inspiring community, full of talent, inclusion, collaboration, and friendship!

#WebPerf #Perfnow

Promotional graphic for performance.now(), the web performance conference held online and in Amsterdam on the 30th and 31st of October, 2025. The design features the conference name “performance.now()” in large text, with details explaining that it’s a single-track event focused on modern web performance topics like JavaScript and CSS performance, performance culture, budgets, monitoring, and post-Core-Web-Vitals strategies. The bottom text reads: “Joan, you’re all set to attend performance.now() – we’ll see you here 30th and 31st of October, 2025.” The background is a gradient of dark to light purple.

October 17, 2025 at 9:56 PM Everybody can reply

2 reposts 5 likes 1 saves

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London Web Standards

@londonwebstandards.org

Our friends at #perfnow are down to their last 11 tickets, don't be slow and disappointed
perfnow.nl

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.

perfnow.nl

October 15, 2025 at 5:39 PM Everybody can reply

2 reposts

2

ppk 🇪🇺

@ppkoch.bsky.social

OK, we're down to our last tickets. There's still room for people to join performance.now() on 30th and 31st of October (in two weeks and a bit), but it's time to decide.

https://perfnow.nl
Last tickets at https://perfnow-2025.eventstack.shop

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.

perfnow.nl

October 13, 2025 at 1:56 PM Everybody can reply

3 reposts 1 likes

3 1

performance.now() conference

@perfnow.nl

OK, we're down to our last tickets. There's still room for people to join performance.now() on 30th and 31st of October (in two weeks and a bit), but it's time to decide.

perfnow.nl
Last tickets at perfnow-2025.eventstack.shop

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.

perfnow.nl

October 13, 2025 at 11:57 AM Everybody can reply

6 reposts 6 likes

6 6

Sareh

@sareh88.bsky.social

Reminder to self to prioritise writing a talk next year! Things can get so busy when starting a new job that time flies. Looking forward to catching up with the videos of this year's PerfNow conf after this month.

October 3, 2025 at 12:58 AM Everybody can reply

2 likes

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Marcy Sutton Todd

@marcysutton.com

I’m writing a talk for @perfnow and realizing I could use new professional headshots. How about in Amsterdam while we’re there for my talk, so we can get family photos taken at the same time? If anyone has photographer recommendations for the end of October, I’d super appreciate it!

October 1, 2025 at 4:42 AM Everybody can reply

1 likes

1 1

Roderick Gadellaa

@rgadellaa.bsky.social

Turns out #perfnow still has tickets for sale, so got mine today. Hyped!

perfnow.nl

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.

perfnow.nl

September 29, 2025 at 7:57 PM Everybody can reply

Tammy Everts 🍁

@tammyeverts.com

How fast is fast enough? I'll be exploring this question in my #PerfNow keynote. I hope to see you there! And if you have your own thoughts on this question, I'd love to hear them!

#webperf #sitespeed #pagespeed #ux

performance.now() conference @perfnow.nl · Sep 15

performance.now() is coming!

@tammyeverts.com asks a seemingly-simple question: How Fast Is Fast Enough? She'll touch on questions — ranging from neuroscience to business metrics — to get you thinking about how you create, measure, and report your performance goals.

perfnow.nl/speakers.htm...

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.

perfnow.nl

September 15, 2025 at 9:40 PM Everybody can reply

3 reposts 5 likes

3 5

Riccardo Margiotta

@riccardomargiotta.co.uk

Right, that's #perfnow day one sorted. 🤩

September 10, 2025 at 2:34 PM Everybody can reply

Tammy Everts 🍁

@tammyeverts.com

I say this every year and always mean it:

WOW, what a speaker (and MC!) lineup we have for @perfnow.nl conference this year! I can't wait to see all these folks on the stage!

This is when #PerfNow ticket sales start to go bananas — and we always sell out — so lock in your ticket soon!

perfnow.nl

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.

perfnow.nl

September 8, 2025 at 7:19 PM Everybody can reply

5 reposts 10 likes

2 5 10

Henri Helvetica 🧑🏾‍🚀🇭🇹

@henrihelvetica.bsky.social

I'm watching #LaraconUS and I see Aaron Francis made the same mistake I made in 2022 at #PerfNow: Black on Black stage makes for comical outcomes. But it looks like Nuno M. (current speaker) also made the same mistake. Anyhow, you can watch the stream yourself.
🎥 www.youtube.com/live/_eMBogM...

A man with glasses and his hands together, wearing a black T-shirt in front of a black background, so that he looks like he's blended in.

image of two gentlemen on stage. One on the left, wearing a white shirt and glasses, the one on the right, looking down at some notes in a black shirt and a bright yellow hat, holding a microphone. His black shirt is blending into the black background, making it look like he actually disappeared

July 29, 2025 at 3:52 PM Everybody can reply

ppk 🇪🇺

@ppkoch.bsky.social

I'm glad that Dutch political life starts to adjust to my conference calendar.

Government fell three days before #cssday. That necessitated new elections, which will take place the day before #perfnow.

June 6, 2025 at 12:20 PM Everybody can reply

8 likes

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Phil Hawksworth

@philhawksworth.dev

Avoiding the fomo this year by eagerly being a part of #perfnow in 2025.

Tickets on sale now to help you avoid that fomo too.

perfnow.nl/speakers.html

May 30, 2025 at 10:10 AM Everybody can reply

3 reposts 5 likes

1 3 5

Tammy Everts 🍁

@tammyeverts.com

Congratulations! Hopefully we’ll still see you at PerfNow?

March 10, 2025 at 5:31 PM Everybody can reply

1

Rick Viscomi

@rviscomi.dev

Maybe I'll put all my thoughts into a blog post at some point. Of course, I'll miss my old team, working with web perf GDEs, and seeing the community at perfnow. But in short, I feel good about it. Change is good, it pushes you and keeps you sharp.

March 10, 2025 at 1:47 PM Everybody can reply

5 likes

1 5

Scott Jehl

@scottjehl.com

Now I really wish I'd read that wiki page before going to PerfNow

February 12, 2025 at 7:17 PM Everybody can reply

2 likes

1 2

Annie Sullivan

@anniesullie.com

@sia.codes and I actually visited the KattenKabinet before perfnow a few years ago!

February 12, 2025 at 6:47 PM Everybody can reply

1 likes

2 1

Andy Davies

@andydavies.me

Yeh, took the Eurostar direct from London to Amsterdam for PerfNow 2023

Took about 4hrs - line between Brussels and Rotterdam isn't high speed so in theory it could take a shorter time

Flew last year but if they finish the new terminal I'll get the train again this year

February 6, 2025 at 11:21 AM Everybody can reply

1 likes

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Dave Letorey

@letorey.co.uk

Paul & Jason's #perfnow litterally blew my mind!
www.youtube.com/watch?v=y1MC...
#WebStandards for the win

Bloomberg Becomes Browser | Jason Williams & Paul Williams | performance.now() 2024

YouTube video by Web Conferences Amsterdam

www.youtube.com

February 3, 2025 at 4:28 PM Everybody can reply

1 likes

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Annie Sullivan

@anniesullie.com

The video from my closing keynote to #perfnow is out!

I talked about how to approach web performance problems--kind of a beginner's guide to becoming an expert. I hope you enjoy!

performance.now() conference @perfnow.nl · Jan 31

The final #perfnow video has been released: @anniesullie.com with Aiming for the Stars

www.youtube.com/watch?v=ORg8...

The full conference is now online.

Aiming for the Stars | Annie Sullivan | performance.now() 2024

YouTube video by Web Conferences Amsterdam

www.youtube.com

January 31, 2025 at 6:01 PM Everybody can reply

16 reposts 39 likes

1 16 39

performance.now() conference

@perfnow.nl

The final #perfnow video has been released: @anniesullie.com with Aiming for the Stars

www.youtube.com/watch?v=ORg8...

The full conference is now online.

Aiming for the Stars | Annie Sullivan | performance.now() 2024

YouTube video by Web Conferences Amsterdam

www.youtube.com

January 31, 2025 at 2:57 PM Everybody can reply

6 reposts 1 quotes 20 likes