Performance and Web Vitals
Collect optional real-user Web Vitals samples and inspect page, device, browser, and country performance.
Kobbe can collect real-user performance samples when you opt in with the tracker. These samples power the Performance dashboard for Core Web Vitals and related page-load metrics.
Performance collection is off by default.
Enable performance tracking
Use the full tracker and add data-performance="true" to your snippet:
<script
defer
data-token="YOUR_SITE_TOKEN"
data-performance="true"
src="https://app.kobbe.io/tracker.full.js"
></script>After visitors generate enough samples, open the site’s Performance page from the sidebar.
Metrics
Kobbe can collect:
| Metric | Meaning |
|---|---|
| LCP | Largest Contentful Paint. |
| INP | Interaction to Next Paint. |
| CLS | Cumulative Layout Shift. |
| FCP | First Contentful Paint. |
| TTFB | Time to First Byte. |
Availability depends on browser support and the page lifecycle. Some browsers or visits may not produce every metric.
Dashboard
The Performance dashboard shows:
- Summary cards for the selected metric.
- A trend chart over the selected time range.
- Slowest pages by p75.
- Device, browser, and country breakdowns by p75.
- Sample counts so you can judge how much data backs each row.
p75 means the 75th percentile. If a page has p75 LCP of 2.5s, 75% of collected samples were at or below that value and 25% were slower.
Privacy
Performance samples are separate from custom events. They are collected only when tracker.full.js is loaded with data-performance="true", are not shown in the Events feed, and count as one accepted performance payload toward monthly usage.
Performance payloads include the current page path, browser/device/location hints already used for analytics breakdowns, and the metric values. Do not enable performance collection unless it fits your privacy notice and the rules that apply to your country, region, audience, and legal basis.