WebPerformance Report

Google Chrome 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

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

github.comwpr-perf-links/2026/perf-links.md at main · WebPerformanceReport/wpr-perf-linksCurated links about Web Performance, used in the Perf Links section of WebPerformance Report. - WebPerformanceReport/wpr-perf-links

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

developer.chrome.comUnload event deprecated in Chrome | Blog | Chrome for DevelopersUnload event deprecated in Chrome

Sources: developer.chrome.com/blog/unload-...

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! 👀 #WebPerf #Sustainability

❤️ 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

webperformancereport.com/httpo/

webperformancereport.comHTTP Observatory Report | WebPerformance ReportHTTP Header Security report every week in your inbox. Reports, Decisions, Results...

romanzipp.comShopify shops hit with ongoing Checkout Hijack attackShopify shops are being hit with a checkout hijack campaign through HulkApps/Swym/Selleasy Shopify extensions.

⚠️ 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: romanzipp.com/blog/shopify...

⚡Featured posts this week: ✨ How Swedish sites LCP changes soft navs: @gustav.ernberg.se ✨ Experimental soft navs now in CrUX: @anniesullie.com ✨ Unload event deprecated: @tunetheweb.com Fergal Daly ✨ JPEG XL vs AVIF: @jakearchibald.com 🙏 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 👉 webperformancereport.com#Catalog #webperf #websecurity #a11y #analytics #seo #ai

From your inbox to motion: anthropic.com ✨ 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. 🚀 👉 webperformancereport.com #WebPerf

⚡Featured posts this week: ✨ How fast is the web?: @twnsnd.com @nicj.net ✨ Measuring back/forward: @awad.dev ✨ SEOs Not Be Responsible Agentic Web: @joehall22.bsky.social ✨ Shipping JPEG XL Chrome: @foolip.org 🙏 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 👉 webperformancereport.com#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. 👉 webperformancereport.com

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

claude.ai/artifact/4Te...

claude.aianthropic.com Load StoryHow anthropic.com loads on a phone

⚡Featured posts this week: ✨ Improving site performance by shipping more CSS: @josh.black ✨ How AI Agents Use Websites: @giacomozecchini.bsky.social ✨ Chasing the Perfect Website: Morgan Murrah ✨ Performance at Scale with Ryan Townsend: @twnsnd.com 🙏 Special thanks to the authors! #webperf

🎉 WebPerformance Report Week #40 is out! ✅ Join our growing community: ⚡ Performance Report 🛡️ Security Report ♿ Accessibility Report 📊 Analytic Report 🔎 SEO Report Explore our report catalog 👉 webperformancereport.com#Catalog #webperf #websecurity #a11y #analytics #seo #ai

Last day of Oktoberfest. SEO still on. 😂🍻

webperformancereport.comThe Technical Diagnostics and Business Outcomes Gap | WebPerformance ReportWhy connecting technical diagnostics to business outcomes matters more than collecting another metric, and how a synthesis layer turns performance, accessibility, security, search and analytics signal...

The Technical Diagnostics and Business Outcomes Gap When tools do not connect, people do. And too often, senior specialists become human APIs between disconnected systems. New WPR article: webperformancereport.com/blog/technic... #WebPerf #Data #Ecommerce

Your metrics, wherever you are. 🚆 The insights come to you. WebPerformance Report 👉 webperformancereport.com

⚡Featured posts this week: ✨ AI Reporting Workflow: @webperfreport.bsky.social ✨ How we made claude.ai 3x faster: Raymond Wang. ✨ Liquid storefronts start loading 29% faster: @krzksz.bsky.social ✨ Blurry before beautiful: @patrickbrosset.com 🙏 Special thanks to the authors! #webperf

🎉 WebPerformance Report Week #39 is out! ✅ Join our growing community: ⚡ Performance Report 🛡️ Security Report ♿ Accessibility Report 📊 Analytic Report 🔎 SEO Report Explore our report catalog 👉 webperformancereport.com #webperf #websecurity #a11y #analytics #seo #ai

☕ Get your Search Console Report: webperformancereport.com/gsc/

We gave Claude Opus 5.5 an article we wrote a few months ago and asked it to turn it into an animation. 👇 📖 The Anatomy of a Web Performance Report calendar.perfplanet.com/2025/the-ana... Thanks for the idea, @addyosmani.bsky.social! #AI #ClaudeAI #WebPerf

It happened. 🥹✨ Since opening our SaaS platform to the public this September, WebPerformance Report has received its first paid subscription. A small step, a big milestone, and a historic moment for WPR. We’re officially generating revenue. 🚀

21 Sept

AI Reporting Workflow ✨ Turn one WebPerformance Report into: → UX & SEO Audits → Benchmarks → Cross-report correlations → Executive summaries → Tickets & tasks → And much more WPR Report → AI → Insights → Action Use ChatGPT, Claude, or Gemini. Link in comments 👇

webperformancereport.com/blog/ai-repo...

21 Sept

webperformancereport.comHow to Turn Web Performance Reports Into an AI Reporting Workflow | WebPerformance ReportConnect your WebPerformance Report history to Claude or ChatGPT, analyze trends across multiple deliveries, and explore performance, search, analytics, accessibility, and security in one conversationa...

20 Sept

⚡Featured posts this week: ✨ New ad metrics in CrUX: @alextcone.bsky.social ✨ The case against JPEG XL: @giannirosato.com ✨ Why Spotify Is Not Using Bayesian A/B Testing: Mattias Frånberg, Mårten Schultzberg ✨ International SEO: @polemicdigital.com 🙏 Special thanks to the authors! #webperf

20 Sept

20 Sept

🎉 WebPerformance Report Week #38 is out! ✅ Join our growing community: ⚡ Performance Report 🛡️ Security Report ♿ Accessibility Report 📊 Analytic Report 🔎 SEO Report Explore our report catalog 👉 webperformancereport.com #webperf #websecurity #a11y #analytics #seo #ai

19 Sept

SEO is now part of WebPerformance Report. 🎉 Our Google Search Console report is live, adding a fifth dimension to WPR. Performance. Security. Accessibility. Analytics. SEO. Founder members + paid plans can now receive #SEO insights directly in their inbox. 👉 webperformancereport.com/gsc/

13 Sept

⚡Featured posts this week: ✨ Resource Age and Its Impact on Cacheability: @paulcalvano.bsky.social ✨ Increased INP impact from Meta Pixel: @erwinhofman.bsky.social ✨ Native is now the future of mobile: Mustafa Ali ✨ UNO Is Underrated: @csswizardry.com 🙏 Special thanks to the authors #webperf

13 Sept

13 Sept

🎉WebPerformance Report Week #37 is out!✅ ⚡Performance Report: webperformancereport.com 🛡️Security Report: webperformancereport.com/httpo/ ♿A11y Report: webperformancereport.com/wave/ 📊Analytic Report: webperformancereport.com/ga4/ 🔎 SEO Report: Coming Soon #webperf #websecurity #a11y #analytics #seo

12 Sept

12 Sept

🔥 We’re ready for tomorrow’s Security Report delivery. CSP Analysis section is back in WebPerformance Report. You’re still in time to receive your Security Report tomorrow. 👉 webperformancereport.com/httpo/ Spread the word! 🙏 #WebPerf #Security #CyberSecurity #WebSecurity

9 Sept

Your WPR report history can already become part of your #AI workflow. ✨ No MCP required. Using #Claude: Connect Gmail/Microsoft Find your latest WPR reports Ask questions Analyze history + generate charts One prompt. Four reports. One clear trend.

9 Sept

Explore the open-source repository → github.com/WebPerforman... See the AI Benchmark Artifact → claude.ai/public/artif...

6 Sept

⚡Featured posts this week: ✨ Submit your proposals for Interop 2027: @rachelandrew.co.uk ✨ Reading a performance profile: @nucliweb.net ✨ HTML over WebSockets: @androsfenollosa.bsky.social ✨ Intro to Web UX and Speed Optimization: @sergeyche.dev 🙏 Special thanks to the authors! #webperf

6 Sept

🎉WebPerformance Report Week #36 !✅ ⚡Performance Report: webperformancereport.com 🛡️Security Report: webperformancereport.com/httpo/ ♿A11y Report: webperformancereport.com/wave/ 📊Analytic Report: webperformancereport.com/ga4/ 🔎 SEO Report: Coming Soon #webperf #websecurity #a11y #analytics #seo #ai

4 Sept

Three Reports. One Multidimensional UX Benchmark: Nintendo.com Built for C-level readers. Full benchmark in the comments 👇

claude.ai/code/artifac...

4 Sept

claude.aiClaude ArtifactTry out Artifacts created by Claude users

WebPerformance Report reposted

Pixel Pioneers

@pixelpioneers.co

1 Sept

We regularly cover #webperformance, and at the PP 2026 edition, @debugbear.com's Matt Zeunert gave a brief intro to page speed, then dived into different network throttling methods in Lighthouse, DevTools, and other tools. 👉 Watch the video of the talk on YouTube: www.youtube.com/watch?v=KO02...

youtube.comWhere Do Your Web Performance Metrics Come From? - Matt Zeunert - Pixel Pioneers 2026YouTube video by Pixel Pioneers