1/ Are SPAs still the best choice for your site? @csswizardry.com predicts a shift away from SPAs in 2025, as modern browser APIs like View Transitions and Speculation Rules make MPAs a more efficient choice for fast, smooth browsing. 🧵👇 #WebPerf #SPAs #MPAs #SpeculationRules

1/ Is compression about to get a major upgrade? @stoyan.me predicts "compression dictionaries everywhere" by 2025. By storing common elements once and sending only the unique parts, we can drastically reduce transfer times. Will you be integrating this? #WebPerf #Compression 🧵👇

1/ 🚀 2025 Web Performance Prediction 5: The ChatGPT Challenge "Customer chat windows powered by ChatGPT will be more prevalent, but they’re unlikely to be implemented in a performant way." – Daniel Gayle, Technical Architect, Performance at Shopify 🧵👇

1/ 🚀 Prediction 4: AI Takes Over Performance Optimization @screenspan.net predicts "AI will play an even bigger role in how we surf, build, debug, and optimize the web" Let’s dive into the key insights for 2025. 🧵👇

@tunetheweb.com and Tsvetan Stoychev predict that 2025 may bring better Core Web Vitals support across all platforms. It’s an exciting possibility for improving performance consistency for all users. 🌍 #WebPerf #CoreWebVitals #INP #SafariPerformance

1/ Lab tests ≠ real user experiences. @SiaKWeb and @KarlijnLowik predict 2025 will be the year RUM becomes the standard for understanding real-world performance. Synthetic tests miss what users feel, RUM doesn’t. 🧵 ⬇️ #WebPerf #RUM #CoreWebVitals

1/ 🚨 Is 2025 the year we crack INP for SPAs? Soft navigations often hide input delays that degrade UX in SPAs. INP helps uncover these issues, making smooth interactions non-negotiable. @tunetheweb.com & @kurtextrem.de predict 2025 is INP’s year. Are you prepared? 🧵👇

🚨 Chrome Web Vitals Extension End of Support With Chrome 132, the Web Vitals extension has officially merged into the Performance panel in DevTools. If you're using the extension, now’s the time to migrate. 🔧 #WebPerformance #CoreWebVitals #DevTools #Chrome #Migration

Rick Viscomi@rviscomi.dev · 2y ago

We've ended support for the Web Vitals extension - just about everything you did there you can now do natively in DevTools More info in today's blog post: developer.chrome.com/blog/web-vit...

1/ 🚀 Kicking off a series on 7 key web performance trends for 2025, featuring insights from experts in the performance community. Stay tuned for the deep dive! 🧵 👇

1/ Measuring INP across browsers has been tricky. Safari & other non-Chromium browsers lack native support, creating blind spots in performance analysis. Our Free INP Polyfill bridges the gap, enabling accurate measurement everywhere. Let’s explore how it works 🧵👇

We may not be able to convert #webperf into music like @screenspan.net, but measuring site responsiveness across browsers is music to our ears 🎶 😜 Wanna know how? Read all about it in @stoyan.org's latest #webperf piece: calendar.perfplanet.com/2024/towards...

Towards Measuring INP on All Browsers and Devices

Web performance metrics are essential for understanding and improving the user experience. While First Input Delay (FID) initially provided a positive outlook on interactivity, the shift to Interactio...

calendar.perfplanet.com

Traditional optimizations make your site fast. But to truly deliver seamless experiences, sites must combine proven tools with speculative loading. It’s not a choice—it’s a strategy. ✨ #WebPerf

Stoyan Stefanov @stoyan.me · 2y ago

Web Performance Calendar day 6 with Ana Boneva on instant pages and speculation rules and how we got here calendar.perfplanet.com/2024/the-evo...

An additional tip: After the user has spotted the problematic LCP element, they can use the AI assistance to ask how the performance of the element can be improved, so you don't only find the problems with the DevTools, but now have the means to solve them as well 🤩

Jecelyn Yeen@jec.fish · 2y ago

🐌 Is your LCP dragging down your page speed? Learn how to use Chrome DevTools to find it! New video in 2 days with a full fixing guide. @tunetheweb.com #webperf #ChromeDevTools

THIS.IS.SO.COOL! 🤯 Kudos @screenspan.net for the original idea! 👏👏👏 Such a strong start of the @stoyan.org's annual #webperf calendar, excited to see what the next days of performance will bring! 🎄

Brian Louis Ramirez@screenspan.net · 2y ago

As a #webperformance engineer I often have to look at “waterfall charts” to see when network requests occur to spot bottlenecks. I wondered what they might SOUND like, so made a little tool to listen to them. calendar.perfplanet.com/2024/how-doe... screenspan.net/soundtrace

2025 is almost here! Another 365 days to make the web faster for everyone 🚀 What do you think will be the biggest #webperf challenges next year? Share in the comments below or simply fill in the form: forms.gle/CbFFfsBtmGcL... We'll gather all answers and make a guide for everyone to use 📋

Web Performance Predictions 2025

We want to hear from you! Share your performance predictions for 2025 - what will be the biggest challenges, which technologies will become even more crucial and where do you think web performance is ...

forms.gle

Unpopular opinion: Shopify's BFCM live tracker is muuuch more fun, than doing the actual shopping on Black Friday 😅 bfcm.shopify.com

Shopify Live Globe 2024

Watch the world shop live

bfcm.shopify.com

This is good. The 5 minute heuristic was un-specced and a bit weird. And seriously people, strongly consider adding even a short caching lifetime for your HTML pages! There's so many benefits!!! Is your content really that critical that you need it to be refetched each and every time?

Yoav Weiss@yoav.ws · 2y ago

Looks like Chromium is about to change how prefetches behave, so that only cacheable resources will be served from the prefetch cache: groups.google.com/a/chromium.o... If you're prefetching your HTMLs, make sure they are actually cacheable, even with a short lifetime.

Reading through the #WebAlmanac this week, one thing is clear: the need for innovation in mobile #webperf is growing. 📱 INP gives a clearer view of user experience, revealing that while desktop metrics remain steady, mobile performance for top sites (10K–1M) has dipped.