Overview
Real-time monitoring of common performance metrics with no tracking.
A live performance overlay on every page. ━━━ What you see ━━━ A panel at the bottom right that updates once per second and shows: • TTFB, FCP, LCP, CLS — the Core Web Vitals that decide how Google ranks your page and how users feel about it • Long Tasks — how often the main thread has been blocked for more than 50ms • Resources — total request count and transfer size • DOM Nodes — flags pages getting too heavy for the renderer • JS Heap — current memory footprint Auto-detects .aspx pages and shows three extra metrics: • ViewState size — catch ViewState bloat that slows down postbacks • .axd request count — spot ScriptResource/WebResource overuse • Miscellaneous hidden fields — the other silent contributor to page weight Every metric is shown with green/amber/red thresholds drawn from web.dev and Lighthouse guidance, so you don't have to remember what "good" looks like. ━━━ Layout visualizer ━━━ Click "Show Boxes" next to DOM Nodes to outline the page's semantic regions — header, nav, main, aside, footer, hero, UpdatePanels, active tab panes — each labeled with its node count. ━━━ Per-site control ━━━ • Toggle the overlay on or off per hostname • Pick exactly which metrics appear • Click any metric label to see its reference documentation ━━━ Privacy ━━━ We don't care about your data so we don't collect, transmit, sell, or share it. Every measurement is computed locally in your browser and shown only to you. No analytics, no telemetry, no remote code, no third-party SDKs, no network requests of any kind. Permissions: • storage — remembers your per-site on/off toggle and metric preferences. • activeTab — lets the popup identify the hostname of the current tab. • Host access (<all_urls>) — required because performance metrics must be measured on whichever page you're viewing.
Details
- Version1.1
- UpdatedApril 16, 2026
- Offered bycraigles
- Size40.28KiB
- LanguagesEnglish
- DeveloperCraig D R Smith
611 26 Ave NW Calgary, AB T2M 2E6 CAEmail
vitalsignssupport@proton.mePhone
+1 403-968-1587 - TraderThis developer has identified itself as a trader per the definition from the European Union and committed to only offer products or services that comply with EU laws.
Privacy
This developer declares that your data is
- Not being sold to third parties, outside of the approved use cases
- Not being used or transferred for purposes that are unrelated to the item's core functionality
- Not being used or transferred to determine creditworthiness or for lending purposes
