I spent hours and hours trawling through the sites of some of the world's best web developers, and despite the horrors I regularly experience in my daily work in Big JavaScript Territory, what I saw left me hopeful: infrequently.org/2025/07/links/

bluesky won't enable this switch by default, but you should.

I'm looking to recruit talented senior engineers that have experience related to web performance monitoring and optimization. If that sounds like you—or someone you'd highly recommend—please send me a DM and I’ll share more details! The role is 100% remote and async-first.

This is incredible data from @dbelson.com showing HTML requests from crawlers versus referrals from that platform. Very easy to see the cost of AI here. ClaudeBot: 70.9k requests : 1 referral (!!!) OpenAI: 1.6K : 1 Perplexity: 202.4 : 1 blog.cloudflare.com/ai-search-cr...

This sounds super interesting. I'm a bit skeptical on how unit economics would work – but compared to we'll-try-to-scrape-everything-we-can-unless-you-can-sue-us-or-fully-block-us, it feels like a great alternative. Would love to see any leading provider send a positive signal..

Cloudflare's Containers are now in public beta. blog.cloudflare.com/containers-a... I was recently struggling to get a WASM version of brotli dictionary_generator (skill issue), but it's a very powerful unlock to just deploy a dockerfile if you need any specific runtime/CPU-intensive work

Free users can now write and deploy their own worker for experiments/prototyping changes. If users could be limited by the pre-made recipes not being powerful enough – you can pretty much do anything now. Finally back on the routine, it's time to play with Shared Compression Dictionaries now!

✨ THE SPDY STREAM ✨ is part of an effort to highlight people in performance and their projects. Show 001 tomorrow w/ @webx.bsky.social Join us! Want a LinkedIn link? DM me. ✨ THE SPDY STREAM ✨ 📅 Wednesday June 18th ⏰ 1pm EST, 13h00 CET 🗣️ Henri 🇨🇦, Vinicius 🇸🇪 🎟️ RSVP: bit.ly/spdy-stream-001

Cloudflare report on yesterday (Jun 12 2025) outage. Definitely respect the non name-shaming vendors policy and showing accountability/ownership instead. Very impressed by how detailed it is given it's been less than 24hs from it. blog.cloudflare.com/cloudflare-s...

"No major incidents"

⚡ Lighthouse (incorrectly) punishes preloading If you’re like me, you probably struggled with Lighthouse scores at least once. “I already optimized everything; why is my score still yellow?” Often, the cause is there’s more to optimize. But sometimes, it’s Lighthouse itself.

Yesterday's hit: llms.txt Today: llms-full.txt Tomorrow: llms-full-final.txt Twomorrow: llms-full-final-v2-this.txt

We only rate dogs. This is Chewbacca having a spa day. He's trying to relax. Please give him some privacy. 13/10

"AI should do my laundry" is something that not everyone agrees with but.. I'm surprised that tools that literally do all the errands I'm lazy to do haven't been nailed before trying to "replace" someone's job. E.g. repeat my coffee order, send invoice, pay rent, etc. Ideally with local models?

Parkinson's Law: all caches will expand themselves until your disk has basically no space left, regardless of the disk's total size.

Users can also write and deploy their own experiments. It's the only feature free users can't access yet. Mainly because I'd want to make sure it can't be abused for anything bad, but also because I absolutely *misunderstood* Workers for Platforms pricing until just now. Should I open it up?

Users can also write and deploy their own experiments. It's the only feature free users can't access yet. Mainly because I'd want to make sure it can't be abused for anything bad, but also because I absolutely *misunderstood* Workers for Platforms pricing until just now. Should I open it up?

The Chrome DevTools Performance panel just leveled up! 🚀 Here's a 69-second taste of the new hotness.

🔥 Simpler browser support info has landed in VS Code! Hover over any CSS property or HTML element or attribute and now you'll see its Baseline status 📝 web.dev/blog/baselin...

One thing I'm really appreciating is how fast I get a result back from Puppeteer (CF Browser Rendering). The video uses the most trivial example (pun intended), but there's only a few extra secs on top of what the page took to load. Will this be the case with 00s of users? Would love to find out!

If you ever thought PageSpeed Insights is great but with X design change it might be better/less confusing for non technical users/etc – I have good news. You can build your own now! It's a bit daunting but actually pretty fun. More focus on real user data? Less? Remove % scores? Or make your own?

One of the core concepts on Dashboards is that they are fully customizable. You can copy and paste any widgets from docs and it works seamlessly. You can share these with stakeholders/colleagues and make sure you're all focusing on the same view (and not getting distracted by noise).

One of the core concepts on Dashboards is that they are fully customizable. You can copy and paste any widgets from docs and it works seamlessly. You can share these with stakeholders/colleagues and make sure you're all focusing on the same view (and not getting distracted by noise).

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

Here's an example on quickly prototyping a change and measuring the before/after in just a few minutes. Am I missing lots of audits/widgets? Yes. But I'm mostly missing a few more folks who don't mind helping me with *candid* feedback and/or see themselves using it! Let me know if that's you! 🫵

Google is consolidating Lighthouse audits to use the new performance insights from Chrome DevTools. PageSpeed Insights will show them as default in ~Oct 2025, but you can try now. I just switched my widget to Insights (no users = no breaking changes 😄). Def need to work more on the details tho!

Very interesting read! I’ve played with both Astro and RSC (via Next.js) in my side project. Ended up using both (Astro serves the www. and proxies Next so the user can’t really tell there’s two different properties altogether). Sorry, I have a thing for over engineering my pet projects. 1/4

Chrome 136+ ships a new V8 version that supports a "compile hint", which makes V8 parse and compile all functions in that file eagerly. Great for entry points – where you know all functions will very likely be used. Less so as 'one weird trick to make all your JS faster'.

The @httparchive.org 's Web Almanac is looking for contributors for this year's edition. github.com/HTTPArchive/...

I’ve been building an app for fun on web perf. You can do most things free (with limits) 1. MODIFY. Change anything on any URL to validate ideas (like WPT Experiments but you get the URLs to profile). My goal is to really push the concept forward, but so far I've focused mostly on easier recipes

When Bruno Simon drops anything 3d on the web – it's a must to give it a try! I've already purchased his Three.js Journey course (check out the reviews if you're interested – folks seems to really love it!), planning to do it later this year. Something tells me it's going to be A LOT of fun

This is a beautiful and inspiring set of thoughts and illustrations on what UI could be wattenberger.com/thoughts/our...

If anyone that follows me and is into webperf is intrigued – please DM me to try it out in the next few days! I'll share a bit more in the next weeks. You can do most things free (w/ limits). I've been having fun building it, maybe it gets to actually be useful too! The "Modifiers" bit, mostly 👀

Emil's course (animations.dev) is one of the best resources I've seen on successfully pushing great & practical animations/interactions to production I'm not personally using Motion but I still got a LOT of insights and tips. And I'm having a lot of fun humbly using some of those on my own work!

For those monitoring Core Web Vitals, we made a small change to the CrUX History API used by CrUX Vis last night and now return 10 months of data, rather than 6 months of data to bring it more inline with the CrUX Dashboard that we're looking to deprecate. Enjoy! cruxvis.withgoogle.com#/

I've completely missed the fact Cloudflare Browser Rendering API now supports Playwright! I've had pretty good results using Puppeteer so far. TBC if variability is decent, etc but it's fun to script journeys (or export them from Chrome Recorder) to measure INP/CLS and still have results quickly

Compression Dictionary Transport allows you to DRASTICALLY reduce download sizes in Chrome. E.g. if you have app.v1.js and app.v2.js is released, a lot of the code is likely the same, so why download it all again? Want to know more? Check out this new guide: developer.mozilla.org/en-US/docs/W...

I'll publish it on LinkedIn later on today, but the startup I'm working at will undergo a 'reorg' aka layoffs. I'm part of it so If you are looking for a Staff / Lead Engineer with emphasis on FE and Perf hit me up (Remote or Hybrid within Stockholm / CET timezone)

Introducing Silk — The most advanced swipeable sheet ever engineered for the web. Native-like experience • Works on all devices • Unlocks dozens of UI patterns on the web. Available for React.

🚨 TypeScript just got 10× faster! The TypeScript compiler has been ported to Go and we had Anders Hejlsberg and Daniel Rosenwasser on to announce it and break it all down! www.youtube.com/watch?v=ZlGz...

The @performanceobserver.dev virtual meetup is back for its 2nd episode! We have @webx.bsky.social and @keerthanak17.bsky.social ready to guide us through another deep dive into #WebPerf Join us live! 📅 March 19th - 6 PM CET (10 AM PT / 1 PM ET) Details and add to calendar (with zoom link)👇

New in Chrome DevTools: Accurately emulate CPU performance of a low/mid tier phone with Automatic CPU throttling calibration! 📲 This feature calculates slow-downs for your specific device. Wanted this for years! We just shipped it.

what do y'all do with your unclosed tabs? I've been running pong inside all 240 of mine blog with a bunch of details over here: eieio.games/blog/running...

TIL Chromium might not handle SWR navigations as you'd expect (seems tracked by issues.chromium.org/issues/40171...). If you're implementing SWR in prod, make sure to test it on multiple browsers but also on your CDNs (even the Good Ones™ to this day have non-fully-spec-compliant implementations).

If there's one thing I could proudly be on a +P99 leaderboard is typing quickly on a keyboard. Super fun website – very interesting navigation! ---- 🏆 Today’s typ.ing: 🌟 Speed: 153wpm 🎯 Accuracy: 100.00% 📝 Training Set: English, most common 100 words 🔢 Capitalization: ❌ Numbers: ❌ Punctuation: ❌

LCP and INP are in Interop 2025!!!! web.dev/blog/interop...

Reminder that this changed rolled out in Chrome 133. If you’re seeing worse LCP times and load your LCP images from another domain (and didn’t have the TAO header set) then that could be why. Read the full thread for details.

What a beautiful surprise to get these extra fields on CrUX APIs! Absolutely fantastic work from the Chrome team, it's hard to describe how extremely useful it is to get this level of UX insight on almost any website, for free and without having to previously convince clients to setup monitoring

There are a number of announcements this month: First up, we have added LCP image subparts to the CrUX API: - Time to First Byte (TTFB) - Resource load delay - Resource load duration - Element render delay These are our recommended way of optimizing LCP: web.dev/articles/opt... 4/10

The Gap 🌟 An interactive article about the CSS gap property in Flexbox and Grid. 🔗 ishadeed.com/article/the-...