PerfReviews ⚡️

React SSR Framework Showdown: TanStack Start, React Router, and Next.js Under Load blog.platformatic.dev/react-ssr-fram… by @matteocollina #React #Performance

We've built over 10 different free tools at DebugBear! Added some screenshots and tidied up our listing page recently: debugbear.com/tools

⚡ Time to First Byte (TTFB) Breaks down server response time into its parts: DNS lookup, TCP connection, TLS handshake, and processing time. If you want to go deeper, DebugBear lets you test TTFB from multiple geographic locations.

🚀 PerfReviews Insights: two new metrics to audit your web performance We've added two new analyses to the tool: #WebPerf #Performance #PerfReviews #WebPerfInsights

Chrome is bringing AI directly into the browser with the Summarizer API. In this post I show how to add an AI-generated summary to blog posts using the Chrome Summarizer API and models running locally in the browser. No external APIs. No token costs. #AI #WebAI #JavaScript #Chrome

Muchas webs siguen sirviendo imágenes PNG de 2–3 MB. Pero esas mismas imágenes pueden pesar menos de 50 kB. La optimización de imágenes sigue siendo uno de los mayores problemas de rendimiento en la web. Hilo 👇

🚀 Treo Site Speed Update: Page-level CrUX data, 2 years of history, and a Free Plan. What's new: • Page-level CrUX report: Real-user metrics for individual pages. • Multi-page reports: Track up to 10 specific URLs in a single report. • Free Plan: Save and monitor your reports for free. • 2 years of BigQuery data: Treo is known for the best origin-level report, and now you can access 2 years of history. • Treo Scan Lite: Auto-discover your top 10 URLs and instantly check their metrics. • UI updates: We kept our signature clean design and made it even better. Test your site: treo.sh/sitespeed

It's early and rough around the edges. If you try it: I want to know what's missing, what's confusing, and whether you'd pay for a more complete version. Feedback form is built in. Takes 2 min. perf.reviews/insights

It runs real checks in a real browser: 🖼 Images: formats, lazy loading, LCP candidate 🎬 Videos: poster, preload, autoplay issues ⚖️ Page weight: breakdown by resource type 📦 Third-party scripts: cost per host Built on WebPerf Snippets, open source performance audits.

I built a free tool to analyze web performance: no login, no setup. Paste a URL → get an instant report on images, videos, page weight and third-party scripts. It's in beta. Try it 👇 #WebPerf #Performance #PerfInsights

They were kind enough to share the following testimonial about our collaboration:

Thank you for the trust and the great collaboration throughout the process I hope we’ll have the opportunity to work together again in the future to continue improving the product, the user experience, and Web Performance practices across the teams

Today I’d like to thank @leboncoin for the opportunity to collaborate with their team over the past few weeks It was a pleasure to analyze their platform, work on improving observability, share methodologies to identify and prioritize Web Performance optimization opportunities.

Stop slowing down your entire app just to test one API. You can now throttle individual network requests in Chrome DevTools to simulate specific bottlenecks without affecting the rest of your session → goo.gle/4aP1Tcc

The JPEG XL Image Coding System: History, Features, Coding Tools, Design Rationale, and Future arxiv.org/pdf/2506.05987

⚡Featured posts this week: ✨ WebPerf Snippets and Agent SKILLs: @nucliweb ✨ The UX Speed Museum: @sergeyche ✨ The GEO Playbook: @KyleRisley ✨ What Are Agent Skills?: @debs_obrien 🙏 Special thanks to the authors! #webperf

WebMCP es el borrador del W3C que permite a un agente de IA descubrir y usar herramientas directamente vía navigator.modelContext WebPerf Snippets de @nucliweb ya lo tiene implementado con 3 herramientas: ➡️listar snippets ➡️buscar por categoría ➡️obtener el código. 🔗👇