PerfLens

Current-tab performance audits, scoring, and optimization suggestions that run only when you click audit

PerfLens is a web performance auditing extension for developers, founders, indie hackers, agencies, and product teams who want clearer performance feedback while browsing and testing real websites. It brings live performance diagnostics directly into your browser workflow, so you can inspect the page you are already using instead of switching between separate tools. PerfLens helps you understand Core Web Vitals, resource weight, accessibility basics, build/runtime context, performance history, and prioritized optimization opportunities from both the popup and the Chrome DevTools panel. PerfLens gives you: - Live Core Web Vitals including LCP, CLS, INP, FCP, FID, and TTFB - A simple 0-100 performance score for the current page - Lighthouse-style audit categories for Performance, Accessibility, Best Practices, and SEO - Resource diagnostics for images, scripts, styles, fonts, third-party requests, and page weight - Detection for oversized images, large scripts, render-blocking resources, weak caching, and missing compression - Basic accessibility checks for alt text, form labels, headings, viewport setup, document language, and link quality - Framework and runtime detection, including local, development, staging, and production-like builds - Build status hints so you know whether you are testing a dev build or production-like page - Prioritized suggestions ranked by impact and effort - Root cause summaries that explain what is likely hurting the page - Performance history per URL - Export tools for saving audit history as JSON - Evidence brief exports for launch reviews, QA notes, and team handoff - A popup view for quick checks while browsing - A Chrome DevTools panel for deeper page-level audits - Network-style summaries for slowest requests, largest requests, third-party resources, transfer size, and blocking candidates - Optional AI-ready fix prompts for local apps, so issues can be copied into your coding agent or development workflow - Launch readiness support for preparing desktop and mobile testing evidence Use PerfLens to: - Check whether a page feels ready before launch - Spot performance regressions while developing - Review real pages during QA - Compare audit history over time - Find high-impact fixes before chasing small optimizations - Explain performance issues to teammates, clients, or stakeholders - Keep performance feedback close to the page you are actively testing PerfLens is built for day-to-day product debugging and launch checks. Lighthouse is excellent for standardized reports; PerfLens is designed to keep practical performance signals close to your current browsing and development flow. Privacy note: PerfLens uses browser performance APIs and stores normal audit data locally with Chrome storage. The extension is designed to run current-tab audits without broad all-website host permissions. Optional platform audit features may connect to a local audit API running on your machine.