WebPerformance Report

@googlechrome just retired the unload event. For years it ran a page’s goodbye code. But it often never ran on phones, and it blocked the instant Back button. Since Chrome 155, it no longer runs by default. Is your site still using it? Sources in the comments. 👇 #WebPerf

Small feature. Big help. 💡 You asked for the numbers behind the colored dots, so we added a Core Web Vitals tooltip to your board. Hover the dots to see the exact LCP, CLS and TBT, and spot trends in seconds. ⚡ 👉 #WebPerf #CoreWebVitals

⚡Featured posts this week: ✨ Todays PHP Security Release: @ThePHPF ✨ Shopify Checkout Hijack Attack: @romanzipp ✨ AI, make the website good: @zachleat ✨ Whats new in the W3C WDS: @studio24 🙏 Special thanks to the authors! #webperf

🎉 WebPerformance Report Week #43 is out! ✅ Five dimensions. One inbox. ✨ ⚡ Performance 🛡️ Security ♿ Accessibility 📊 Analytics 🔎 SEO Get automated reports delivered to your inbox! 👉 #webperf

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Something greener is coming to WebPerformance Report. 🌱 We've wanted to bring sustainability reporting to WPR for quite some time. Using data and tools from The Green Web Foundation, we're making it happen! 🌍 More soon! 👀

❤️ A simple wishlist. A serious security threat. ⚠️ How can a third-party Shopify app turn into a checkout hijacking attack? We explain it in 60 seconds. 🎬 #WebSecurity #Shopify #CyberSecurity

⚠️ @Shopify stores targeted by an ongoing checkout hijacking campaign. Malicious redirects through third-party apps can send customers to fake checkout pages designed to steal payment information. Details & updates:

⚡Featured posts this week: ✨ How Swedish sites LCP changes with soft navs: @gernberg ✨ Experimental soft navs in CrUX: @anniesullie ✨ Unload event deprecated: @tunetheweb Fergal Daly ✨ JPEG XL vs AVIF for web: @jaffathecake 🙏Special thanks to the authors! #webperf

🎉 WebPerformance Report Week #42 is out! ✅ Join our growing community: ⚡ Performance Report 🛡️ Security Report ♿ Accessibility Report 📊 Analytic Report 🔎 SEO Report Explore our report catalog 👉 #webperf #websecurity #a11y #analytics #seo #ai

From your inbox to motion: ✨ Four weeks of Web Performance reports, transformed into a visual story. Ready to see how your website performs? Get your reports delivered straight to your inbox. 🚀 👉 #WebPerf

⚡Featured posts this week: ✨ How fast is the web?: @RyanTownsend @nicj ✨ Measuring back/forward: @logaretm ✨ SEOs Not Responsible For Agentic Web: @joehall ✨ Shipping JPEG XL Chrome: @LucaVersari3 @MoritzFirsching @foolip 🙏 Special thanks to the authors! #webperf

🎉 WebPerformance Report Week #41 is out! ✅ Join our growing community: ⚡ Performance Report 🛡️ Security Report ♿ Accessibility Report 📊 Analytic Report 🔎 SEO Report Explore our report catalog 👉 #webperf #websecurity #a11y #analytics #seo #ai

Our reports are already being prepared for Sunday. 🌙 Performance, Accessibility, Security, SEO and Analytics reports, delivered to your inbox every week. Good news: you’re still on time. Sign up today and get your first report this Sunday. 👉

@AnthropicAI: A Load Story We turned latest performance report into a cartoon. One character spends 3 seconds ignoring your taps. 🙈 What's stopping you from animating your report? 👉 Interactive version in the comments.

⚡Featured posts this week: ✨ Improving site perf by shipping more CSS: @__joshblack ✨ How AI Agents Use Websites: @giacomozecchini ✨ Chasing the Perfect Website: Morgan Murrah ✨ Perf at Scale with Ryan Townsend: @RyanTownsend 🙏 Special thanks to the authors! #webperf