#webperf

feat: experimental Chrome DevTools CLI by OrKoN · Pull Request #1100 · ChromeDevTools/chrome-devtools-mcp This PR enables an alternative CLI interface for Chrome DevTools MCP. chrome-devtools can be used in shell scripts to automate the Chrome DevTools MCP session running as a daemon process. Currently...

3 days ago

The Chrome DevTools MCP 0.20.0 has a new feature: experimental chrome-devtools CLI 🤩

github.com/ChromeDevToo...

#WebPerf #DevTools #CLI #MCP #AI

2 1 0 0

PerformanceObserver

@performanceobserver.dev

3 days ago

Episode 10 | PerformanceObserver - YouTube In this episode, Paul Calvano dives deep into querying the HTTP Archive dataset to uncover web trends, while Tammy Everts breaks down the "Performance Platea...

Videos from our last meetup are now live! Check out the talks by @tammyeverts.com and @paulcalvano.bsky.social !

#webperf

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

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Sia Karamalegos

@sia.codes

3 days ago

February 2026 Theme Vitals Update February 2026 performance data is live now. Overall Shopify performance is improved, and Horizon saw a small uptick maybe from a fixed browser bug.

February data is now live on Theme Vitals - see how your favorite Shopify themes perform on Core Web Vitals and the latest updates on Horizon...
themevitals.com/newsletter/2...

#Shopify #webperf

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4 days ago

WebPerformance-Report -Sponsored-DebugBear-2026

🚀 DebugBear @debugbear.com has renewed its sponsorship of WebPerformance Report for another year. 🎉

Thank you, DebugBear, for supporting the next phase of WPR. ⚡🤗

#webperf

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4 days ago

Table titled “Results” showing reductions in JavaScript bundle sizes for web performance features. Columns: Skill, Before, After, and Reduction. • webperf-loading: 24,199 B → 11,149 B (−54%) • webperf-core-web-vitals: 13,890 B → 10,266 B (−26%) • webperf-interaction: 17,143 B → 12,443 B (−27%) • webperf-media: 13,273 B → 12,017 B (−9%) • webperf-resources: 11,700 B → 11,026 B (−6%) • Total L2: 82,916 B → 59,612 B (−28%) The table highlights overall bundle size reduction after optimization.

When a Skill activates, its SKILL.md loads into context. The webperf-loading was 24 KB, most of it unnecessary to decide which script to run

I applied progressive disclosure and brought it down to 11 KB

#WebPerf #Performance #AI #AIAgent #AIPerf

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@beingoptimist.bsky.social

4 days ago

Improve Your Website's Performance
perf.reviews/en

#WebPerf #Performance

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BeingOptimist

5 days ago

HTTPS Redirect Checker | Test HTTP to HTTPS 301 Check if your website correctly redirects HTTP to HTTPS. Use our free HTTPS Redirect Checker to detect missing or wrong 301 redirects and fix security and SEO issues.

Mixed http/https redirects can hurt both trust and rankings. Run your URLs through this HTTPS redirect checker to confirm clean, consistent 301/302 redirects across your site: beingoptimist.in/tools/securi...
#https #redirects #websecurity #technicalseo #webperf

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Inautilo

@inautilo.bsky.social

6 days ago

WebPerf Snippets A curated list of snippets to get Web Performance metrics to use in the browser console or as snippets on Chrome DevTools by Joan León

#Development #Collections
WebPerf Snippets · Performance profiling directly in the DevTools console ilo.im/169jrs by Joan León

_____
#Measuring #Debugging #Network #Browser #DevTools #WebVitals #WebPerf #WebDev #Frontend #JavaScript

1 0 0 0

6 days ago

⚡Featured posts this week from Perf Links by WebPerformance Report:

⚡Featured posts this week:
✨ WebPerf Snippets and Agent SKILLs: @nucliweb.net
✨ The UX Speed Museum: @sergeyche.dev
✨ The GEO Playbook: @kylerisley.bsky.social
✨ What Are Agent Skills?: @debbie.codes
🙏 Special thanks to the authors!
#webperf

4 2 1 0

6 days ago

Stylized screenshot of a dark code editor window titled “WebPerf Snippets agent-first: structured returns and minimal tokens.” It contrasts two approaches: • Before: an agent parsing a console string like “🟢 LCP: 1.24s (good)”. • After: a structured JSON-like object containing performance data for the Largest Contentful Paint (LCP) metric, including fields such as script: "LCP", status: "ok", metric: "LCP", value: 1240, unit: "ms", rating: "good", thresholds for good and needs improvement, and details about the measured element (img.hero, hero.avif, sizePixels: 756000). The graphic illustrates the shift from parsing human-readable console output to returning structured performance data for agents.

WebPerf Snippets agent-first

WebPerf Snippets SKILLs were written for humans: emojis, colours, tables.

The agent had to parse all of that.

I added structured JSON returns and a build with terser that removes the console code. 80 lines → ~300 characters.

#WebPerf #AI #Performance

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Beyond Static Resources: Delta Compression for Dynamic HTML Compression Dictionary Transport (RFC 9842), authored by Patrick Meenan and Yoav Weiss, lets browsers...

6 days ago

🎉 WebPerformance Report Week #10 is out! ✅

🎉 WebPerformance Report Week #10 is out! ✅
🔍 Ready for next Week? Don’t miss out!
⚡ Web Performance Report: 👉 webperformancereport.com
🛡️ HTTP Security Report: 👉 webperformancereport.com/httpo/
♿️ A11ty Report: 👉 webperformancereport.com/wave/
#webperf #websecurity #accessibility #a11ty #ai

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Barry Pollard

@tunetheweb.com

1 week ago

Good blog post from Carlos (a colleague) about a new proposed addition to Compression Dictionaries allowing short-lived HTML pages to continue to be used as compression dictionaries for longer:

dev.to/carlosmateom...

#webperf

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Firefox

@firefox.activitypub.awakari.com.ap.brid.gy

1 week ago

Beyond Static Resources: Delta Compression for Dynamic HTML Compression Dictionary Transport (RFC 9842), authored by Patrick Meenan and Yoav Weiss, lets browsers...

Beyond Static Resources: Delta Compression for Dynamic HTML Compression Dictionary Transport ( RFC 9842 ), authored by Patrick Meenan and Yoav Weiss, lets browsers use previously seen content as co...

#webperf #http #compression

Origin | Interest | Match

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Firefox

@firefox.activitypub.awakari.com.ap.brid.gy

1 week ago

Beyond Static Resources: Delta Compression for Dynamic HTML Compression Dictionary Transport (RFC 9842), authored by Patrick Meenan and Yoav Weiss, lets browsers...

Beyond Static Resources: Delta Compression for Dynamic HTML Compression Dictionary Transport ( RFC 9842 ), authored by Patrick Meenan and Yoav Weiss, lets browsers use previously seen content as co...

#webperf #http #compression

Origin | Interest | Match

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Joseph Scott

@josephscott.bsky.social

1 week ago

No one cares how fast it is if it is broken. That is why I still include fixing things in performance work. #webperf

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Timo Tijhof

@timotijhof.net

1 week ago

Introducing: Autonomous Systems report Today we’re publishing our first report of the performance experienced by visitors of Wikimedia websites, focused on the Autonomous Systems visitors are connecting from.

@slightlyoff FYI:

techblog.wikimedia.org/2019/03/27/autonomous-sy...

https://performance.wikimedia.org/asreport/

Raw TSV-data is linked there and goes back to 2019.

#browserstats #webperf #perfmatters #asreport

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Tammy Everts 🍁

@tammyeverts.com

1 week ago

SpeedCurve | The speed of trust: How slow pages hurt your brand In a competitive market, page speed is as important as your design and content.

A slow UX affects people’s perception of three important brand elements that are completely unrelated to page speed: content, design, and usability.

Here's why that takeaway is relevant in an increasingly competition online landscape 👉 www.speedcurve.com/blog/brand-p...

#webperf #ux #pagespeed

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WebPerf Snippets and Agent SKILLs: deterministic audits with Chrome DevTools MCP | Joan León WebPerf Snippets become Agent SKILLs with scripts as deterministic tools for AI agents, executable directly in the browser via Chrome DevTools MCP.

1 week ago

In the article:

• Architecture of the 6 SKILLs (CWV, Loading, Interaction, Media...)
• Workflows with decision trees: if TTFB > 600ms → run Sub-Parts.js
• Install: npx skills add nucliweb/webperf-snippets

joanleon.dev/en/webperf-s...

#WebPerf #WebPerformance #AI #DevTools #MCP

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@archivozeromx.bsky.social

1 week ago

WebPerf Snippets and Agent SKILLs: deterministic audits with Chrome DevTools MCP

Claude Code report showing Usercentrics scripts causing performance issues by combining 'preload' and 'async'. It recommends removing preloads or using fetchpriority='low' to avoid competing with critical LCP resources.

I've been using WebPerf Snippets in my audits for years.
Scripts to measure LCP, INP, CLS, TTFB, Render Blocking...

The next step: turning them into tools an AI agent can use autonomously.
But there's a design decision that makes all the difference.

🧵

#WebPerf #WebPerformance #AI #DevTools #MCP

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1 week ago

Cómo Dominar el Marketing de Respuesta en 2026 . Si sientes que tus campañas de siempre están perdiendo fuerza, no es que el público no quiera comprar, es que las reglas del juego han mutado. Aquí

Si tu landing tarda 3 segundos, tu marketing de 2026 ya fracasó. #WebPerf #Marketing archivozeromex.blogspot.com/2026/02/el-n...

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Performance Engineer, Backend Automattic’s products—WordPress.com, WooCommerce, Beeper, Tumblr, Jetpack, and more—serve tens of billions of page views every month from data centers around the world. The PerfOps team exists to make...

1 week ago

Taught Claude Code to prioritise loading the first image in a post 😉

#WebPerf

4 1 1 1

Joseph Scott

@josephscott.bsky.social

1 week ago

The performance team I lead at Automattic is hiring - automattic.com/work-with-us... #webperf #php #jobs #wordpress #woocommerce

6 5 0 0

Ryan Townsend

@twnsnd.com

1 week ago

Taming The Cookie Consent Monster

Finally got round to publishing my article on implementing faster/better cookie consent banners: lessonsofacto.com/articles/006...

It's a lot (>3700 words!) so there's a demo site here: cookie-consent-example.netlify.app and the heavily-commented code is here: github.com/ryantownsend... #webperf

7 2 1 0

1 week ago

⚡Featured posts this week from Perf Links by WebPerformance Report:

⚡Featured posts this week:
✨ The browser is the sandbox: @paul.kinlan.me
✨ Stop trying to rank for keywords: @jono.id
✨ HTML Video & Audio Lazy-loading: @scottjehl.com
✨ Investigating… a High LCP for Nike.com: @aarontgrogg.com
🙏 Special thanks to the authors!
#webperf

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