Core Web Vitals (CWV)
Preventive lab monitoring: catching performance regressions before they hit your users and SEO — this tool measures six key web metrics daily, under controlled conditions, on your site's critical pages, so technical problems are caught and fixed before they ever reach field data.
Updated: Dec 2025
What business value does Core Web Vitals deliver?
This dashboard runs daily lab tests (Lighthouse-style) on the key pages you select, evaluating the site's technical structure and performance. Unlike the Infrastructure & Network and Render & Interaction dashboards, which run on real user traffic, this section sends a controlled robot to visit the pages instead.
The business advantage of this approach: results are fully repeatable and free of real-traffic noise — meaning you have a dedicated "quality-control lab" that continuously tracks Google's standards and the user experience of your landing and product pages, so you learn about problems before an SEO ranking drop or customer churn.
This dashboard splits into two key parts:
1. The page table & six metrics
This part shows the list of your target pages and their health status all in one place.
- Page table (Layout): instead of confusing raw URLs, pages are organized under practical labels (e.g. "Homepage" or "Product page") along with the last successful check date (this list's capacity depends on your project plan).
- Mobile / Desktop: two fully independent assessments, since a page might perform great on desktop while degrading on mobile. The system defaults to the mobile version to keep focus on the busiest, most sensitive channel of user experience.
- Six standard metrics: precise monitoring of LCP, CLS, FCP, TTFB (as a single lab run), INP and TBT.
2. Trend chart, comparison & Telegram report
This part gives you the key tools for tracking improvement trends and fast notification.
- Daily trend chart: shows each metric's change over time alongside green and red dashed lines (Google's official thresholds). Crossing these lines means an early warning, before Google or your users react.
- Smart comparison: assess performance across three ranges — Yesterday, Last week (each day compared against the same day the previous week on one chart), and Last month (the last 28 days against the equivalent prior period) — to measure how effective your technical changes were.
- Daily Telegram report: connecting the Shahin Telegram bot sends you a summary of your monitored pages' status at a set time. This connection activates through a simple flow (open the bot, Start, confirm) and can be disabled any time.
3. Key points for analyzing the data correctly
- Lab vs. the real world: these tests run via a robot under controlled conditions, so the goal is stability and repeatability, not a full substitute for real user behavior.
- Built on global standards: every threshold matches Google's official standards — none are a subjective or internal Shahin convention.
- Exclusive metrics: TBT can only be measured on this dashboard due to its lab-only nature (its field equivalent is INP, which for extra precision is also checked in this same lab test).
- Flexible reporting: receiving reports via Telegram is entirely optional, and all information is viewable in the panel at any moment.
FAQ
Those two dashboards are built from real user traffic, but here a controlled robot tests the same page every day; the result is repeatable and free of real-traffic noise, but it’s not an actual user’s experience.
Because TBT is lab-only and can’t be measured from real traffic; if you’re looking for its field equivalent, that’s INP.
That depends on your project plan; once the cap is full the add button is disabled, and depending on your plan you’ll see an “Upgrade plan” path or a “Submit a support ticket” path.
They’re fully independent assessments, so a page can pass on desktop and fail on mobile; the default view is mobile too, since it’s usually the worse, busier experience.
They come straight from Google’s official Core Web Vitals definition, not an internal Shahin convention; crossing one means a status change, before you or Google notice.
They share the same definition, but here it comes from a single lab run on that registered page, while on Infrastructure & Network it’s the P75 of your whole site’s real traffic; that’s why the two numbers can differ slightly.
Through a three-step flow — open the bot, hit Start, and confirm; after that you get a daily summary of your monitored pages at a set time, and you can disable it whenever you want.
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