Estela Franco

✨ It’s that time of year! The State of JavaScript 2025 survey is currently running. 😄

I take the survey every year. It’s a great way to keep up with all of the new features and APIs that have come to browsers in the past year.

stateofjs.com/en-US

performance.now() 2026 will take place on 19th and 20th of November 2026. #perfnow.

PerfNow25 - Big Data, Zero JS: Cross-Browser Virtual scrolling Big Data, Zero JS Cross-Browser Virtual Scrolling CONTAIN & CONTENT-VISIBILITY

Here you go! My first perf now as a speaker… it’s was amazing 🤩

docs.google.com/presentation...

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/

Making Sense of LoAF by Andy Davies Over time the web has become more reliant on JavaScript… but we’ve very little information on how its growth is affecting our visitors’ experience.

Making Sense of Long Animation Frames…

The slides from my #PerfNow talk are available on Notist

noti.st/andydavies/9...

Web Performance Allies - PerfNow 2025 Image credits: https://commons.wikimedia.org/wiki/File:TAR_Detour_clue.png https://commons.wikimedia.org/wiki/File:Carach_Angren_M%C3%A9an_22_08_200…

Here are mine: speakerdeck.com/ethangardner...

person on stage during a presentation showing a slide that reads SPDY STREAM.

For those who just watched @tunetheweb.com 's presentation, this is the SPDY STREAM he just posted about w/ @yoav.ws + @krzksz.bsky.social of Shopify. Thank again Barry!
#perfNow

🎥 youtu.be/DHgoULxvuJ8

Always, always happy to see @yoav.ws get a shout-out. So much incredible work has happened because of him. Most recent example—speculation rules in WebKit. #perfnow

One of my favourite pictures from 2023 #perfnow @tunetheweb.com @andydavies.me

How to Benchmark Your Site Speed Against Competitors Knowing which of your competitors are faster than you is a great way to get web performance buy-in throughout your organization.

Loving @ethangardner.com’s talk about making #webperf allies! Totally agree that competitive benchmarking can get marketing folks excited about performance Fun fact: you can do that with @speedcurve.com!

#PerfNow

support.speedcurve.com/docs/competi...

TIL #perfnow

Why is it important to make your website more accessible?

- Disabled people need access
- The legal situation in the EU
- Build better software as an outcome
- Accessibility design and engineering is cool!

@marcysutton.com at #perfnow

Marcy on the stage. Behind her, a slide with the following text: Accessibility meets performance: How quickly a website loads when users can't see it, becomes interactive, and responds to user actions. It encompasses both the objective, measurable accessibility of a page and the user's subjective perception of that experience. https://marcysutton.com/accessibility-and-performance

Third talk of the day! @marcysutton.com is talking about Accessibility and Performance. I absolutely love this topic, it’s so close to my heart! ❤️
#perfnow

Stuart on duty!
#perfnow

Interaction to next paint: business value Interaction to Next Paint (INP) is the new Core Web Vital. Learn how INP affects user frustration, conversion, and bounce rates.

Here’s the study from Contentsquare, in which they analyzed Interaction to Next Paint for 997 retail sites. #PerfNow

contentsquare.com/blog/interac...

How Fast Is Fast Enough? [PerfNow 2025] It sounds like a simple question, but if you've been working in web performance long enough, you know the answer is far from straightforward. In this ke…

Slides from my @perfnow.nl talk — How Fast Is Fast Enough? — are up!

If you’re at #PerfNow (or even if you’re not) I’d love to talk about creating a delightful experience for your users.

speakerdeck.com/tammyeverts/...

Harry on the stage. Behind him, a slide that reads as follows: "While a good TTFB doesn't necessarily mean you will have a fast website, a bad TTFB almost certainly guarantees a slow one." — csswz.it/ttfb

Friendly reminder! #perfnow

Harry on the stage. Behind him, a slide with the following text: how to think like a performance engineer

Second talk by @csswizardry.com. How to think like a performance engineer.
#perfnow

Tammy on the stage. Behind her, a slide reads as follows: Google thresholds does not equal Your business thresholds

No, Google's thresholds are not the same as your business's. Find your own target.
#perfnow

Tammy on the PerfNow stage. Behind her, a slide reads as follows: Fast is magical. Fast eliminates cognitive friction. Raycast surfacing the right application before you finish typing feels like an extension of your mind. Superhuman's sub-100ms rule—plus their focus on keyboard shortcuts-changed the email game in a way that no one's been able to replicate, let alone beat. I recently used Mercury to pay another business that uses Mercury, and its instant settle felt surprising in a world where bank transfers usually take days. Catherine Jue, Co-founder at Kernel catherinejue.com/fast

Day 1! First talk by @tammyeverts.com. How fast is fast enough?
#perfnow

New case study on wpostats.com

Relive improved LCP by 50% and cut out layout shifts and saw a 3% increase in conversion rate, 6% decrease in bounce rate and 9% increase in page views per session.

wpostats.com/2025/10/02/r...

I mentioned before that we’re switching Lighthouse Performance audits to the new and improved Insights. The same Insights that you can see in DevTools Performance panel traces.

That’s happening in Lighthouse 13 due to be released very soon. Maybe even this week!

11ty Hacks For Fun and Performance - Infrequently Noted Alex Russell on browsers, standards, and the process of progress.

I've been implementing some improvements in my @11ty.dev blog, mostly related to performance and deferred code loading. I'm pretty happy with the results, and hope they might be useful to someone else too:

infrequently.org/2025/10/11ty...

Monetizar tu conocimiento es totalmente legítimo.
Perder la honestidad por vender, no.

(4/4)

Y llamar “Máster” a algo que no tiene reconocimiento oficial para generar sensación de prestigio o confundir a tu audiencia es, como mínimo, poco ético.

En definitiva, usar la ilusión de miles de personas que buscan formarse como estrategia comercial deja un sabor muy amargo.

(3/4)

El problema no es querer vender. Es cómo se hace.

Anunciar un curso gratuito para meter a miles de personas en un embudo de ventas no es marketing educativo, es publicidad encubierta.

(2/4)

Esta semana hemos visto otro caso de marketing agresivo disfrazado de formación gratuita.

Un curso online de 3 días anunciado como “gratuito” y con “certificado” que acabó siendo, en su último día, un embudo para vender un supuesto “Máster” de 1500 €.

(1/4)

😂