AI had a fever dream about a brand-new Core Web Vital. 
I'm not going to call out the tech company blog where I saw this. I'm posting it as a cautionary tale about using ChatGPT to write about subject matter that's outside your wheelhouse.
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We checked the WebPerformance of Y Combinator's website before Sunday’s delivery. Everything looks good!
Take a look at the report:
https://webperformancereport.com/report/wpt/250530_BiDcF3_F0B?utm_source=webperfreport&utm_medium=mastodon
#webperf #crux #corewebvitals #ux #seo #startup
webperformancereport.comWeb Performance Report 2025 | Week #22 | www.ycombinator.com | 250530_BiDcF3_F0BWeb performance report every week in your inbox.
Different pages have different scores, but I've made good headway tonight. A lot more green numbers than at the start, that's for sure.
One more session should be enough for me to fix anything I have control over AND is worth the effort.
There are some accessibility tweaks I also need to do. But I've fried my brain tonight, so I need rest.
Sorry, no alts added to these images.
WebPerformance Report Week #17 is out and today we celebrate a new milestone! 
For the first time, we delivered two reports in one day:
Web Performance Report HTTP Header Security Report https://webperformancereport.com/
#webperf #corewebvitals #ux #seo #cybersecurity #websecurity
We just passed 1,000 followers on LinkedIn!
A huge THANK YOU to everyone in the Web Performance community for your support.
Let’s keep pushing for a faster web together! 
https://www.linkedin.com/company/webperfreport/
#webperf #corewebvitals #ux #seo
My annual "page bloat" analysis and update covers:
Page growth YOY How page bloat hurts your business and users How it affects #CoreWebVitals (and potentially #SEO) Page size targets How to track page size & complexity How to fight regressions
I had so much fun revisiting these articles from the past year.
Huge props to our awesome @speedcurve team – including @andydavies @cliff and @Joseph_Wynn – for creating such helpful resources for our community!
https://www.speedcurve.com/blog/popular-web-performance-posts-2024/
SpeedCurveSpeedCurve | Our 10 most popular web performance articles of 2024We love writing articles that help folks solve performance and UX problems. Here are the ones you loved most in 2024.
Core Web Vitals: Der Schlüssel zu besserem SEO!
Wusstest du, dass Ladezeiten, Layoutstabilität und Reaktionsgeschwindigkeit entscheidend für dein Google-Ranking sind? 
In unserem neuen Podcast erfährst du, wie du die Core Web Vitals optimierst und gleichzeitig die Nutzererfahrung verbesserst.
Hör jetzt rein: https://linktr.ee/seodeutschland
Hashtags: #SEO #CoreWebVitals #WebsiteOptimierung #DigitalMarketing #GoogleRanking #ContentMarketing #SEODeutschland #Suchmaschinenoptimierung
Preparing for @perfnowconf in 
this week. Just packing my gear for 
THE HALLWAY TRACK streams.I have my special #CoreWebVitals mics ready. I know @anniesullie will love these. Want to have a quick 5-10 min chat? Come see me. Also:
I'll be at the WebPerfDays Unconference, and I may record some of the content. Stay tuned. I'll also attempt to get some clips from the Performance.sync() with the @mozilla + @FirefoxPerf team meetup as well.
Excited.
The next edition of the Performance Matters newsletter is queued up for delivery next week, and it is PACKED with #webperf and #UX goodness!
It's not too late to sign up and join our 15,500+ subscribers. (I promise we will not spam you!)
https://www.speedcurve.com/newsletter/
#sitespeed #pagespeed #corewebvitals
SpeedCurveSpeedCurve | Speed Matters NewsletterGet great performance content – no filler! – delivered to your inbox every month.
Google's @johnmu says it again, it is doubtful you'd see big search ranking drops over Core Web Vital issues https://www.seroundtable.com/google-ranking-drop-core-web-vitals-38297.html
We’ve released an exciting update to the Chrome DevTools Performance Panel landing page:
monitor your local Core Web Vitals in real time compare them to real-user data from CrUX and more…
Learn all about it in today's blog post:
GIF
Google no longer supports First Input Delay, one of the pioneering #CoreWebVitals metrics. This post covers:
What FID measured & why it was deprecated What is Interaction to Next Paint & why it has replaced FID How to optimize INP
SpeedCurveSpeedCurve | Hello INP! Here's everything you need to know about the newest Core Web VitalWhat is INP? How does it correlate with user behaviour, such as bounce and conversion rates? And how can you improve it?
Loving this new Local & Field Metrics panel in Canary Chrome's devtool > Performance panel.
To enable it:
- open devtools, click the settings cog in the top right
- choose Experiments on the left hand menu
- find "Performance Panel - enable live metrics landing page" & tick it
You'll be invited to reload devtool, after which if you open it whilst looking at a page, & navigate to the performance panel, you'll see live local data, & optionally real user metrics from CrUX.
I'm so happy to see our new Web Performance Guide is being widely shared! If you're new to #webperf and #ux (or just need a refresher), the guide includes:
Psychology of #pagespeed
Getting started with #CoreWebVitals
Understanding charts and metrics
Optimization techniques
SpeedCurveWeb Performance Guide | SpeedCurveEverything you need to know to master website monitoring, analytics, and diagnostics from world class experts.
I analyzed test results for 20 top websites and discovered many of them do not take advantage of #webperf / #UX optimizations – including low-hanging fruit – that could make their pages faster, their users happier, and their businesses more successful.
https://www.speedcurve.com/blog/15-neglected-page-speed-optimizations/
SpeedCurveSpeedCurve | 15 page speed optimizations that sites ignore (at their own risk)Many top sites are not taking advantage of optimizations that could make their pages faster, their users happier, and their businesses more successful.
Our customers are always telling us how much they appreciate the user-friendliness of the articles we create for them. So we recently decided to make them available to everyone, not just @speedcurve users. Introducing the Web Performance Guide – covering everything from measuring ROI to optimizing Core Web Vitals!
SpeedCurveSpeedCurve | New! Web Performance GuideEverything you need to know to master website monitoring, analytics, and diagnostics. Learn how to deliver a fast, joyous experience to all your users!
What you can learn about the world's leading websites on @speedcurve's interactive Page Speed Benchmarks dashboard:
Current & historic #webperf of top retail/media/travel sites in the US, EU, UK & Japan
Filter by metric (including Core Web Vitals like LCP & CLS)
Filter by fast desktop vs slow mobile
Drill down for Lighthouse audits, waterfall charts & more!
https://app.speedcurve.com/benchmarks/europe/media/slow/largest-contentful-paint/
SpeedCurvePage Speed Benchmarks | SpeedCurveWe rank industry-leading websites based on how fast their pages appear to load, from a user’s perspective.
Every year I revisit the topic of web performance budgets. Here's my updated guide, including:
What are performance budgets? Why are they a crucial tool in fighting page speed regression? Best metrics to track Determining thresholds Pro tips
https://www.speedcurve.com/blog/performance-budgets/
#ux #pagespeed #corewebvitals #webperf #webperformance
SpeedCurveSpeedCurve | A Complete Guide to Web Performance BudgetsIf you're not already using performance budgets to prevent regressions, you should be! Here's how to get started.
@adactio reveals the real reason why Google is replacing FID with INP in its core web vitals—indeed, why FID existed in the first place. 
adactio.comFidinpampA small-scale conspiracy theory from the innards of Google.