Kolaboro / Engineering / Real-user speed
Real-user speed
How fast kolaboro.com is for real visitors, not for a test machine: the 75th percentile of four speed measures, per page type and device, with the number of samples behind every figure.
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What the four numbers mean
- LCP (Largest Contentful Paint): when the main content appeared.
- INP (Interaction to Next Paint): how long the page took to react to a tap, click or key press. Only measured when the visitor interacted.
- CLS (Cumulative Layout Shift): how much the page jumped around while loading. No unit; lower is better.
- TTFB (Time to First Byte): how long the first byte of the page took to arrive.
The 75th percentile means three out of four page views were at least this fast. It is the figure Google uses for Core Web Vitals.
How it is collected
- A small script on our pages (/k/vitals.js, no third-party library) reads the four numbers with the browser's PerformanceObserver and sends them once, when the visitor leaves or hides the tab.
- Each sample holds only a page type, a device class (mobile when the browser says it is a mobile device or the window is 760 px wide or less, otherwise desktop), the metric and its value. No IP address, cookie, page address or user id is stored.
- Bots, Lighthouse and our own test browsers are dropped. Back-and-forward navigations and pages opened in the background are skipped.
- The figures on this page are computed from the live table when you load it (cached for 10 minutes), over the last 7 and 28 UTC days.
- Minimum sample rule: a figure is shown only when it rests on at least 20 samples. Below that, the cell shows the sample count only.
Limits
- Collection started on 4 November 2026 and traffic is still small, so many cells do not have enough samples yet. That is the honest state, and it fills in as people use the site.
- Not every browser reports every metric, so the sample counts differ between metrics.
- Daily figures per page type, without the device split, are also published at /api/x/f/vitals.
Related: page weight, visual tests, system status.