Last month one of my websites had a surprise Google Maps API bill ($nnnn), up 600% from prior, via AI crawlers (my guess) using headless browsers more frequently (so fully loading DOM + thus load Goog Dynamic Maps API). Feels like every month, AI crawlers triggering more issues on my hobby websites!

Intent to Ship: PerformanceSoftNavigation and InteractionContentfulPaint performance entry Great for web performance measurement with today's modern SPA frameworks! We've been tracking this closely in the W3C WebPerf Working Group groups.google.com/a/chromium.o...

I'm amazed these weeks how my daily workflow has changed so much vs. 12 months ago. I now check-in with a personal agent (tracking work projects in Markdown), another agent helps me work with a codebase or two, and another (trying Hermes at home) helping monitor some of my community projects.

✨ SPDY STREAM 037 ✨ with Tsvetan Stoychev of Basic RUM. This episode introduces new RUM tooling. Tsvetan, the maintainer of Basic RUM sits with us to share the tool's raison d'être, blind spots that he covers after years of savoir faire working @ a CDN. Join us! 📅 June 18th, 11am lnkd.in/gV95KkP2

#W3C RUM Community Group (RUMCG) 2026-06-10 meeting minutes + recording are now available: w3c-cg.github.io/rum/meetings/

Favorite use of Claude for the week: Pasting lspci -vv output from a new server into it, and having it give me a summary of which devices are at their proper (or unexpected) PCI Gen speeds and lanes.

We switched Speculation Rules on Shopify storefronts from conservative to moderate eagerness. Here's how that went: performance.shopify.com/blogs/blog/f...

Faster storefront navigations with moderate speculation rules

We upgraded Speculation Rules to moderate eagerness on all Liquid storefronts. Desktop navigations are now 285ms faster at the median, with near-zero TTFB.

performance.shopify.com

One of the most important pieces about web performance that I've ever worked on is finally live. After a few months of work, my analysis of the correlation between site speed and conversion across the entire @Shopify platform is out: www.shopify.com/enterprise/b...

Store Speed and Conversion: What the Data Shows (2026) - Shopify

How does site speed relate to sales? Find out in this Shopify data deep dive.

shopify.com

Web Performance Calendar day 15 with @nicj.net, @cliffcrocker.bsky.social and @karlijnlowik.bsky.social Löwik presenting an update on W3's RUM Community Group and YOU calendar.perfplanet.com/2025/rumcg-a...

RUMCG - A year in review

performance.now() 2024 was the year we officially launched the W3 RUM Community Group. The idea to form a community group around real user monitoring (RUM) came from the desire to come together as ven...

calendar.perfplanet.com

Built my first federated app. Each new publicly hosted instace announces their existence, and if correctly configured, will be accepted into the mesh of the meshes ... already seeing eight instances in different regions.

Modernized my 25+ year web-hosting habit by Docker'ing all the things. My contribution to a Apache+PHP container: github.com/nicjansma/do...

GitHub - nicjansma/docker-apache-php-fpm: Container for Apache 2.4 + PHP-FPM 7/8.

Container for Apache 2.4 + PHP-FPM 7/8. Contribute to nicjansma/docker-apache-php-fpm development by creating an account on GitHub.

github.com

W3C RUM Community Group's discussion on HTTP Header Adoption (Timing-Allow-Origin and Server-Timing) was fun! Minutes, slides, recording and transcript are here: w3c-cg.github.io/rum/meetings/ TLDR: Goal to provide guides on adopting headers, a Server-Timing registry, and outreach to popular 3Ps.

I was this many years old when I finally learned how to debug PHP "properly" (step debugging via XDebug using VSCode on a remote container). Until now I've only ever debugged PHP via echo or error_log() statements. I've been writing PHP code since ~1998. I'm living in the FUTURE everyone! :P

Experimentation in the homelab! Switched from #Prometheus + #Thanos to just #VictoriaMetrics (w/ migration of 2yrs of data), much happier! Prom would die on larger dashboards/queries, OOM. VM is 20% of the size of Prom, and queries insanely fast! 30s+ queries in Prom/Thanos, now taking <1s in VM.

Daily uploads and a two year review! rumarchive.com/blog/2025-01... #webperf

RUM Archive - Daily Uploads and a Two Year Review!

rumarchive.com

My latest post on the Performance Advent Calendar is now live: calendar.perfplanet.com/2024/when-us... This one talks about the elephant in the rüm of user interactions. #perfmatters #webperf #rum #ux #cwv #inp

When users interact

When looking at the Core Web Vitals, we often try optimizing each independently of the others, but that's not how users experience the web. A user's web experience is made up of many metrics, and it'...

calendar.perfplanet.com

Hail!

In our meeting yesterday, we decided to adopt Element Timing (and the followup Container Timing work) into the working group. CfC coming up!! We also discussed some upcoming improvements to the crash reporting API (still in incubation). Minutes: w3c.github.io/web-performa...

w3c.github.io

Would you want core web vitals In Safari? Can you help me understand how you would use them and why numbers in one browser isn’t enough? (These may sound like silly questions, but I’d love to understand *your* specific context and use cases)

#PerfNow: My favorite nerd week of the year! ❤️

The performance panel custom tracks @jackfranklin.bsky.social talks about open up some exciting possibilities!! It would be neat to standardize the values :D #perfnow

We've just published a new set of widgets to help analyze your core web vitals on mPulse: blog.akamai-mpulse.com/blog/2024-11... #webperf #perfmatters

Thanks for the shout out! Also, the RUM Archive has 3P resources data, so you can see the history of some of these over time. rumarchive.com/blog/2023-11...

RUM Archive - RUM Archive Third-Party Resource Data

rumarchive.com

Tammy Everts 🍁@tammyeverts.com · 2y ago

Great tool created by @nicjj.bsky.social that measures the impact of individual third-party scripts BEFORE you add them to your pages. #perfnow 3rdparty.io

Took 2 mins at #PerfNow to talk about the RUM Community Group in W3C for anyone doing RUM. It's free and easy to join if you're interested! www.w3.org/community/ru...

Guess who's back? Just getting up at @perfnow.bsky.social. So, I'll be live streaming some interviews from the conference _ LIVE. Lock into the Youtube channel: www.youtube.com/@henrihelvet...

The all new performance chapter of the 2024 Web Almanac written by Jevgenija Zigisova and @inesakrap.bsky.social almanac.httparchive.org/en/2024/perf...

Performance | 2024 | The Web Almanac by HTTP Archive

Performance chapter of the 2024 Web Almanac covering Core Web Vitals, with deep dives into the Largest Contentful Paint, Cumulative Layout Shift, and Interaction to Next Paint metrics and their diagno...

almanac.httparchive.org

Proud of the mPulse team at #PerfNow, our first booth in a few years. Come by to learn more, enter to win one of two Zelda Switchs!

Great start to #perfnow this year with @tammyeverts.bsky.social and @csswizardry.com ! For those of you looking for the general web perf starter pack, here it is! Lots of new folks since last time I shared it go.bsky.app/RVWSVqe

Great chart to visualize where and how Core Web Vitals are available #PerfNow

First post! In AMS for #PerfNow. Looking forward today's pre-event WebPerfDays Unconference!