Why you shouldn’t only look at your page speed score
Preparing For Interaction To Next Paint, A New Web Core Vital
CI/CD workflow improvements, more powerful RUM, and more! Here's what we shipped this month.
Why web performance tools should be reporting website carbon emissions: https://calendar.perfplanet.com/2023/why-web-perf-tools-should-be-reporting-website-carbon-emissions/ #webperf #webdev #environment #goGreen
🔗 “Sizes=‘auto’ pretty much requires width and height attributes” by @eeeps
I haven’t checked but I think this unsubscribe form might have a bit of cumulative layout shift 😬#WebPerf
Mobile INP performance: The elephant in the room
As @cliff explains in this post, only 65% of mobile sites have "good" Interaction to Next Paint. Why? How much can this hurt your business? And how can you fix it before INP dethrones FID as the responsiveness metric in #CoreWebVitals in March?
MacBook delivery day – time to get even more disconnected from the reality of end user #webperf 😉
I learned some surprising things when testing the performance of social media embeds that sent me down a rabbit hole: https://css-irl.info/testing-the-performance-of-social-media-embeds/ #webperf
💖 Anyone can work on web performance.
Don’t know where to start? We have a handy introduction guide.
🔗 “Psychology of Speed: A Guide to Perceived Performance” by @fox
These days, folks are tasked with being more productive than ever, despite having smaller teams and budgets. It's hard!
A few weeks ago at @perfnowconf I shared tips and best practices for how to chase impact. Topics include how to:
• Identify your critical rendering path
• Focus on the pages that matter
• Fix the low-hanging fruit
• Manage expectations
• Use performance budgets to fight regressions
• Quantify success – and brag about it!
⚡ Your weekly reminder to check in on Interaction to Next Paint.
INP will become a Core Web Vital in March 2024. Check yours and ensure it’s in the green.
Now that INP has arrived to dethrone FID as the #CoreWebVitals responsiveness metric, it's time to scrutinize its effectiveness. @cliff looks at real-world data and asks: What correlation does INP have with #UX and business metrics?
Debugging styles in an enterprise app that has (at least) 980 CSS custom properties (aka CSS vars) and dev tools for CSS are much slower than I'm used to.
I still have a hard time believing the massive proliferation of CSS custom properties doesn't have a performance cost to the end user. Probably not enough for small/medium sites to care, but enough that it shouldn't be ignored by enterprise products/ecosystems.
It's a deep-dive into how prioritisation works in browsers and what to look out for that indicates it's not working as expected... WITH ACTUAL SWORDS ⚔️
Definitely worth a watch!