Page Load Time Tracker – Web Vitals Monitor

Measure page load time and Core Web Vitals (LCP, CLS, INP) across a browsing session, then export CSV or Markdown reports for QA.

Measure how fast the site you are testing really is — page load time and Core Web Vitals, page by page, across a whole browsing session. Click Start, browse normally, and every page load is captured with a full timing breakdown. Click Stop and export the session as a CSV report or paste a Markdown summary straight into your issue tracker. Built for QA engineers, web developers and site owners who need real numbers from real browsing, not a one-off lab score. ⏱ MEASURE • Full timing breakdown per page: DNS, TCP connect, time to first byte, download, DOM Content Loaded and First Contentful Paint • Core Web Vitals per page — Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS) and Interaction to Next Paint (INP), rated good / needs-improvement / poor against Google's thresholds • Single-page apps are first-class: route changes that never fire a load event are measured from their network activity • Optional AJAX/fetch tracking logs the duration of every background request during the session (toggle in the popup) • The toolbar badge shows the last page's load time and turns green, yellow or red as performance changes 📊 LIVE SESSION STATS • Pages tracked, session duration, last / average / min / max load time • Median (P50) and P90 load time — see typical AND worst-case performance, which averages can't tell you • AJAX request count and average duration • Recent-pages list with per-page times; pause and resume the session at any point 📄 REPORT • One-click CSV export: per-page timing breakdown, per-domain summary, top-5 slowest pages, AJAX log and a session summary with percentiles • "Copy as Markdown" produces a ready-made report that Jira, GitHub and GitLab render — bullets, percentiles and a per-page table • Clear all data with one click 🚀 GETTING STARTED 1. Click the toolbar icon and press Start — that's it. No account, no setup, nothing to configure. 2. Browse the site you're testing. The badge shows each page's load time; the popup shows the session statistics building up live. 3. Press Stop, then Download Report (CSV) or Copy as Markdown for your bug ticket or test report. 🎯 MADE FOR • QA engineers documenting performance during manual regression passes • Developers checking how a staging deploy actually feels across many pages • Site owners collecting evidence of slow pages before and after a fix • Anyone who needs "which pages are slow, and how slow" as a shareable report 🔒 PRIVACY Everything stays on your device. Tracking only happens during sessions you explicitly start, all data is stored locally in your browser, and nothing is ever sent anywhere — no servers, no analytics, no accounts. Stop the session and the AJAX tracker is removed from pages immediately. ABOUT THE PERMISSIONS Chrome will note that this extension can read data on the websites you visit. That access exists for one reason: injecting the small timing-measurement snippet into pages you visit during a session you started, so their load time can be read from the browser's own Performance API. Outside an active session nothing is injected and nothing is collected. There is no background activity and no developer server — the full privacy policy is linked on this page.