I like this idea - it would make using prerender an easier decision in more places #webperf

Spurs v. Thunder, Game 1 - wow, double overtime, that was an intense and fun game! This is the type of 7 game series you always hope for in the playoffs #nba

I had a great time working with @itsdavemartin.bsky.social on a building a new way to use WordPress.com to easily start a private social network just for friends & family - or for those that really appreciate the short form blogging experience - wordpress.com/blog/2026/04... #wordpress

TIL: PHP_CLI_SERVER_WORKERS for the #php built-in web server - www.php.net/manual/en/fe... - not sure how I missed that, as I've used the built-in server for local dev work from time to time

I noticed this #utah #jazz ice cream at the store the other day www.facebook.com/FarrsIceCrea... - given how bad the Jazz were this year I half expect this to have a very bitter taste #nba

That project AI was helping me with that I was so excited about a while back? It's finally ready enough for some public exposure: I bring you "Waterfall Tools": blog.patrickmeenan.com/2026/04/12/i...

I really enjoyed watching Project Hail Mary - overall positive message about our ability to do incredibly hard things when we work together and sacrifice for one another.

My 16 year old after seeing the 1971 Willy Wonka movie for the first time - "why did they ever remake this, Gene Wilder was perfect" - no argument from me :)

I get a surprising amount of satisfaction from deleting dead code

🚫 When All You Can Do Is All or Nothing, Do Nothing For all you weekend warriors, advice for times of uncertainty. csswizardry.com/2026/03/when...

Week 1 observations: toni.org/2026/03/13/i...

I'm thrilled to announce that I'll be joining Bluesky as interim CEO. I deeply believe in what this team has built and the open social web they're fighting for. More here: toni.org/2026/03/09/c...

SQLite PSA sqlite.org/releaselog/3... sqlite.org/wal.html#wal...

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

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

"Add a minimal privacy-preserving secure DNS telemetry to check current version" salsa.debian.org/php-team/php... - surprised and disappointed to see this #php #security #debian

Definitely feeling "the last 20% takes 80% of the work" right now.

Many developers misinterpret what the DevTools performance test results tell them. My video below explains how Chrome implements network throttling and how it impacts your data. Neither the bandwidth nor the latency implementation match what you'd see on a real slow network. youtu.be/93HI4dnGjMk

Safari 26.3 is here with Zstandard file compression, Navigation API’s AbortSignal for better control in single-page apps, and fixes for anchor positioning, multi-column layouts, & more. Plus fullscreen video now dims surroundings in visionOS. webkit.org/blog/17798/webkit-features-for-safari-26-3/

It's been a while since my last blog post, so I made up for it with a wall of text 😅 This article looks at why JS-heavy web apps tend to miss their performance goals over time, what you can do to somewhat mitigate that, and ends with a plea for us to move back to the server, as an industry.

Container Timing is now officially Ready for Developer Testing in Chromium 145! 🚀 We want your feedback on the design and usage. Check out the details and how to try it: blogs.igalia.com/dape/2026/02... cc @igalia.com @developer.chrome.com

Both of these websites have a 2-second LCP score – but the user experience is very different! Learn about how to relate metrics to visitor experience on your website: www.debugbear.com/blog/web-per...

Why do sites keep offering to save or remember this computer, if they never, ever, ever actually remember this computer? So frustrating.

Days where it feels like LLMs might be the best rubber ducking experience so far - one that can talk back and often provide something useful.

That warm feeling of looking at a function and thinking to yourself - there is a very good chance I can make that faster.

Anyone has tried out Mago - mago.carthage.software - a linter/formatter/analyzer for PHP code? I gave it a very brief run against a single PHP file and was surprised at how aggressive the defaults are. It might be a very useful tool, but I'd need to config it to be more reasonable first. #php

The annual tradition of going back over my last 12 days of date references to fix the year in dates that I wrote down.

Compression Dictionaries with Zstandard in PHP josephscott.org/blog/2026/co... #webperf

I am starting to think that the iOS 26 OS/UI experience equivalent of the Apple butterfly keyboard and touch bar. iOS 27 could do a full UI revert to the iOS 18 UI and be heralded as tremendous improvement. #apple

How to Switch Debian 13 /tmp from tmpfs to disk - josephscott.org/blog/2025/ho...

With the #LogicMonitor ( couldn't find a Bluesky account ) acquisition of Catchpoint I have a request. Please revert the UI changes that were done to webpagetest.org recently. I just want my long trusted go to web perf tool back.

I'm playing around with JPEG XL's "JPEG repackaging" feature. It repackaged a 147kb JPEG down to 126kb, but on my Pixel 10, the new file takes 78ms to decode, vs 10ms for the JPEG. At 3g+ speeds… that feels like a performance loss. random-stuff.jakearchibald.com/apps/img-dec...

So many times that my kids and I have made this joke 🦷🕝😀

I like the idea of `dns-persist-01` - datatracker.ietf.org/doc/html/dra... - "Unlike the existing "dns-01" challenge, this record is designed to persist and may be reused for multiple certificate issuances over an extended period." - one less moving part when generating a new cert.

Inspired by perfnow.nl, I've dusted off drafts of my network and device situation analysis. Good news/bad news: devices and networks are improving, but pages are swelling. The web is usable for the wealthy, but less so for everyone else. infrequently.org/2025/11/perf...

Out-of-order HTML patching, another proposal from TPAC, lets HTML be presented non-linearly, and a single file can update multiple parts of the page. Would this feature be useful to you?

#LCP and #INP support in #Safari really coming close now (maybe even in 2025?) as Safari 26.2 Beta Release Notes includes: - support for the Event Timing API - Largest Contentful Paint metric Great work by the #Webkit team! A blogpost: www.rumvision.com/blog/safari-...

Realizing now that for my #webperf folks I should have dressed up in the scariest of all possible Halloween costume: your p99 metric value

Do future you ( and others ) a favor - check your return values. Funny how something that was an edge case that "never happens" at some point in the future starts happening every day.

Using the new WPT UI that @catchpointsystems.bsky.social just rolled out, and I'm angry and sad and frustrated and deeply confused all at once. What an utter debacle. Roll this back.

Tomorrow we lose access to the current version of WebPageTest and will be forced into the new version. I’m dreading the switch. Experiments are a HUGE step backwards and I use them all the time. The interface may be consistent with Catchpoint UI, but it is boring and confusing if all you use is WPT.

Login flows that require me to bounce back to email are way more annoying than the traditional username/password.

Injecting an automated blurred preview at the beginning of an image file is an interesting approach. At some point, if you can get the blurred preview down to a small enough size it seems worthwhile to just include in the image itself.

I suspect INP and LCP in Safari is going to be a real eye opener. Looking forward to more perf data from all those iPhone users.

Wait, Tron: Legacy was 15 years ago? It is official, my sense of time is unreliable.

To everyone who insist on breaking the ability to paste into forms on the web - stop it.

I did not have "figuring out odd ways to optimize MySQL queries" on my bingo card for 2025 - but here we are 😆 #mysql #mariadb

🚨 New tool: Impolighthouse Not just “how fast is my site?”, but “why is it slow, and what does that say about our org?” A deliberately impolite wrapper on top of Lighthouse, that calls out your organizational cruft, blockers & bad decisions. www.jonoalderson.com/impolighthou...

forgot to put this up somewhere so here you go. visualize your favorite zlib stream! lynn.github.io/flateview/