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PerfReviews
@perf.reviews
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🇺🇸 Experts in web performance, we help you to solve performance issues

🇪🇸 Expertos en web performance, te ayudamos a solucionar problemas de rendimiento

https://perf.reviews/
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perf.reviews
PerfReviews @perf.reviews · Nov 5
We Improve Your Website's Performance

Increase your revenue and make your users happier with our web auditing and optimization services

👉 perf.reviews/en

#WebPerf #Performance #PerfReviews
We Improve Your Website's Performance Increase your revenue and make your users happier with our web auditing and optimization services.
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nucliweb.net
Dr. @guaca.bsky.social explains the diagnosis with @debugbear.com of our symptoms at DevFest Barcelona 2025

#DevFestBCN2025 #WebPerf #PerfTools #DevFest
November 22, 2025 at 10:55 AM
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nucliweb.net
Nuevo post "Más Allá de INP: LCP y el 90% invisible del rendimiento" de la serie de Long Animation frames API (LoAF)

joanleon.dev/posts/loaf/m...

#WebPerf #Performance #LoAF #LCP #CoreWebVitals
Más Allá de INP: LCP y el 90% invisible del rendimiento | Joan León
Descubre cómo LoAF va más allá de INP. Aprende a detectar scripts que bloquean el LCP y a distinguir entre JavaScript pesado y layout thrashing para aplicar la optimización correcta.
joanleon.dev
November 21, 2025 at 7:11 PM
perf.reviews
Effectively Monitoring Web Performance

www.smashingmagazine.com/2025/11/effe... by @mattzeunert.com

#WebPerf #Performance
Effectively Monitoring Web Performance — Smashing Magazine
There are lots of tips for [improving your website performance](https://www.debugbear.com/blog/improve-website-performance?utm_campaign=sm-10). But even if you follow all of the advice, are you able t...
www.smashingmagazine.com
November 20, 2025 at 6:46 PM
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nucliweb.net
I've updated the WebPerf Snippet "Find non Lazy Loaded Images outside of the viewport" to list images without loading="lazy". Now it shows:

- Total number of images
- Total file size
- Individual details: URL, resolution & file size

#WebPerf #WebPerfSnippets #PerfTools
Chrome DevTools Console showing lazy loading audit results: 46 images without lazy loading detected, totaling 4.34 MB, with a list displaying the first 5 images showing their resolution (900x600) and individual file sizes ranging from 14.63 KB to 104.76 KB.
November 20, 2025 at 6:30 PM
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nucliweb.net
Dark mode = On
Stack of holographic stickers with 'WebPerf Snippets' text in gradient colors ranging from blue to turquoise to yellow-green against a black background, arranged on a white wooden surface
November 20, 2025 at 10:38 AM
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nucliweb.net
Obs.js: context-aware web performance for everyone

csswizardry.com/Obs.js/demo/ by @csswizardry.com

#WebPerf #PerfTools #Performance #WebPerfSnippets
Obs.js – context-aware web performance for everyone
Obs.js reads device and network signals and allows you to build adaptive user experiences.
csswizardry.com
November 20, 2025 at 11:30 AM
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debugbear.com
Our free HTML size analyzer can tell you what's taking up space in your HTML!

Identify embedded images, fonts, or JavaScript hydration state.

www.debugbear.com/html-size-an...
November 20, 2025 at 12:30 PM
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nucliweb.net
I reached peak performance using @chromedevtools.bsky.social's Performance panel! #DevBadges

developers.google.com/profile/badg...
Speedster  |  Google Developer Program  |  Google for Developers
Earn this badge by clicking on an insight after running a performance trace in Chrome DevTools' Performance panel
developers.google.com
November 17, 2025 at 7:05 PM
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tunetheweb.com
Chrome 143 will start rolling out today (most users get it next week).

It includes a new set of options for your webperf traces — including saving sources & source maps:
developer.chrome.com/docs/devtool...

This makes it easier for those viewing traces outside of the page load to get more context.
Save performance trace options: - Include annotations - Include resource content - Include script source maps - Compress with gzip
November 18, 2025 at 5:10 PM
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nucliweb.net
AI assistance for performance

developer.chrome.com/docs/devtool... by @matthiasrohmer.bsky.social

#WebPerf #Performance #PerfTools #AI #PerfAI
AI assistance for performance  |  Chrome DevTools  |  Chrome for Developers
Understand performance profiles - with the help of AI
developer.chrome.com
November 16, 2025 at 5:27 PM
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nucliweb.net
Do you know the Web Performance Working Group?

The mission of the Web Performance Working Group is to provide methods to measure aspects of application performance of user agent features and APIs.

www.w3.org/webperf/

#WebPerf #Performance
Web Performance Working Group
A group page
www.w3.org
November 16, 2025 at 5:35 PM
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mattzeunert.com
HTML parsing speed depends a lot on how powerful the device that's visiting the website is.

When I measure parse time on my laptop it takes under 7 milliseconds to process one megabyte of HTML. But on a low-end Android phone it takes 88 milliseconds!

www.debugbear.com/blog/html-pa...
November 17, 2025 at 10:10 AM
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nucliweb.net
Quina il•lució em fa participar al #DevFest Girona 2025 ☺️

#GironaDevFest2025
Una mà sosté una acreditació de ponent d’un esdeveniment DevFest davant d’un ordinador portàtil obert. A la pantalla del portàtil es mostra una diapositiva de presentació sobre Chrome DevTools MCP i agents d’intel·ligència artificial per al rendiment web, amb la imatge d’un xip electrònic marcat amb les lletres ‘AI’.
November 15, 2025 at 12:16 PM
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sia.codes
I just wrote 'October 2025 Theme Vitals Update'.
themevitals.com/newsletter/2...

#webperf #Shopify
September 2025 Theme Vitals Update
September 2025 performance data is live now. Overall Shopify performance is down on mobile, and Horizon has plateaued for now
themevitals.com
November 11, 2025 at 8:24 PM
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nucliweb.net
I'm excited to share a fantastic YouTube channel dedicated to Web Performance

It's a project led by 2 major references in the Web Performance community, @guaca.bsky.social & @sia.codes

www.youtube.com/@Performance...

Subscribe to stay up-to-date & learn from the best in the community!

#WebPerf
PerformanceObserver
PerformanceObserver is a virtual meetup for the web performance community. Our community is spread out around the world, and not everyone can easily access in-person tech events. Thus, our mission wa...
www.youtube.com
November 11, 2025 at 9:15 AM
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nucliweb.net
📣 New in Web Performance!

We can now use the WebPerf Snippets for LCP & INP in Safari Technology Preview

This allows us to measure 2 of the most critical Core Web Vitals metrics directly within Apple's browser

Time to test!

webperf-snippets.nucliweb.net

#WebPerf #Safari #CoreWebVitals #LCP #INP
Screenshot showing the WebPerf Snippets website section for Interactions (INP). The browser console, highlighted in red, displays the detailed output of an interaction tracking snippet, listing the Input delay, Processing time, and Presentation delay for multiple mouse events, along with a "good" score validation. Screenshot showing the WebPerf Snippets website section for Largest Contentful Paint Sub-Parts (LCP). The browser console output is highlighted, showing the breakdown of the LCP metric (915 ms) into its four key components: Time to first byte, Resource load delay, Resource load time, and Element render delay, including the time in milliseconds and the percentage of the total LCP time for each sub-part. Screenshot showing the WebPerf Snippets website section for Largest Contentful Paint (LCP). The browser console output is highlighted, displaying the calculated LCP value (915 ms) and details of the Largest Contentful Paint element, including its URL, size, and load time.
November 10, 2025 at 8:25 AM
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nucliweb.net
Debugging de INP: Del 'algo va lento' al 'esto es lo que lo rompe'

Ahora nos enfrentamos a la tarea más importante: entender qué es lo que está causando esos frames lentos y, en última instancia, rompiendo nuestro INP.

joanleon.dev/posts/loaf/d...

#WebPerf #INP #LoAF #Performance
Diagrama comparativo que muestra dos líneas de tiempo superpuestas. La primera línea, etiquetada como Evento, tiene una duración de 250 milisegundos y está representada con una barra discontinua naranja. Debajo, la segunda línea, etiquetada como LoAF, muestra una duración de 200 milisegundos, también con una barra discontinua naranja que se solapa parcialmente con la superior. Debajo de ambas líneas aparece una flecha apuntando hacia arriba acompañada del texto: “Se superponen → están relacionados”, indicando que los dos eventos se solapan en el tiempo y por tanto están vinculados.
November 6, 2025 at 1:07 PM
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nucliweb.net
How to optimize SVG files: A complete guide for beginners

penpot.app/blog/how-to-... by @laurakalbag.bsky.social

#WebPerf #ImagePerf #SVG #Image
How to optimize SVG files: A complete guide for beginners
SVG files use mathematical formulas to create graphics, allowing infinite scaling without losing quality, and making them perfect for high-res displays and responsive design.
penpot.app
November 5, 2025 at 5:02 PM
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nucliweb.net
Fundamentos de Long Animation Frames API

Descubre cómo Long Animation Frames API (LoAF) resuelve el mayor problema al debuggear INP: saber exactamente qué código causó una interacción lenta. Fundamentos, código práctico y conceptos clave

joanleon.dev/posts/loaf/f...

#WebPerf #INP #PerfTools #LoAF
Tabla titulada “Qué te da LoAF que otras herramientas no”. Compara cuatro herramientas —Event Timing, Long Tasks, DevTools y LoAF— según distintos tipos de información. Las filas y columnas muestran lo siguiente: • Fila 1 (Encabezados): • Información • Event Timing • Long Tasks • DevTools • LoAF • Fila 2: • Nombre de función • Event Timing: ❌ • Long Tasks: ❌ • DevTools: ✅ • LoAF: ✅ • Fila 3: • Archivo o URL del script • Event Timing: ❌ • Long Tasks: ⚠️ Limitado • DevTools: ✅ • LoAF: ✅ • Fila 4: • Tiempo de forced layout • Event Timing: ❌ • Long Tasks: ❌ • DevTools: ⚠️ Manual • LoAF: ✅ • Fila 5: • Disponible en producción • Event Timing: ✅ • Long Tasks: ❌ • DevTools: ❌ • LoAF: ✅ • Fila 6: • Attribution automática • Event Timing: ❌ • Long Tasks: ❌ • DevTools: ⚠️ Manual • LoAF: ✅ En resumen, la tabla destaca que LoAF ofrece todas las funcionalidades, mientras que las demás herramientas presentan limitaciones parciales o carecen de ciertas capacidades
November 5, 2025 at 10:50 AM
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nucliweb.net
"SSR is about ~SEO~ performance" - @rich-harris.dev

#perfnow #WebPerf
A speaker is presenting at the performance.now() 2025 conference in front of a large audience. The slide projected behind them reads “SSR is about SEO performance,” with “SEO” crossed out and “performance” emphasized in red.
October 31, 2025 at 4:32 PM
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nucliweb.net
If you are interested and want to learn about Web Performance, I recommend subscribing to @henrihelvetica.bsky.social's channel, where you will find high-quality videos from leading figures in the Web Performance community

📺 www.youtube.com/@HenriHelvet...

#WebPerf #Performance #Learning #YouTube
Henri Helvetica
www.youtube.com
November 3, 2025 at 5:33 PM
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nucliweb.net
New stickers for the WebPerf Snippets project

webperf-snippets.nucliweb.net

#WebPerf #WebPerfSnippets #PerfTools
A collection of white rounded rectangular stickers displaying 'WebPerf Snippets' text in a gradient from blue to teal. Seven stickers are fanned out in a cascading arrangement on a dark gray textured surface, with one sticker placed separately to the right.
November 4, 2025 at 5:12 PM
perf.reviews
We have new stickers 🥰
A collection of white rounded stickers displaying the PerfReviews logo, which features a black lightning bolt icon surrounded by green dots and a green curved line, with 'PerfReviews' text below. Five stickers are fanned out on a dark gray textured surface.
November 4, 2025 at 4:53 PM
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perfnow.nl
A little aftermovie to whet your appetite.

www.youtube.com/watch?v=ByOC...
This was performance.now() 2025
YouTube video by Web Conferences Amsterdam
www.youtube.com
November 4, 2025 at 11:51 AM
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nucliweb.net
Huge thanks to @andydavies.me for mentioning the LoAF Helpers WebPerf Snippet at @perfnow.nl!

Honored to be part of the amazing Web Performance community 🫶

🔗 webperf-snippets.nucliweb.net/Interaction/...

#WebPerf #PerfNow #Performance #LoAF #INP #CoreWebVitals
A speaker stands on stage at the Performance.now() 2025 conference, presenting a slide titled “LoAF Helpers: Advanced Debugging in DevTools.” The slide displays details about WebPerf Snippets and a highlighted URL link. The audience is seated in front of the stage, watching the presentation.
October 31, 2025 at 10:21 AM