Question 1

What's the difference between this and PageSpeed Insights?

Accepted Answer

PageSpeed Insights runs a single synthetic test under lab conditions. This collects continuous data from real visitors on their actual devices and networks — the same kind of data Google itself uses for ranking.

Question 2

How many visitors do I need before the data is reliable?

Accepted Answer

Low-traffic sites will naturally take longer to build a statistically solid picture, but even a few hundred real sessions over a week start to reveal patterns a one-off lab test can't show.

Question 3

Does monitoring this slow down my client's site?

Accepted Answer

No — the measurement runs as a lightweight beacon in the visitor's browser after the page has already loaded, so it doesn't add to the page's own load time.

Question 4

Can I track Core Web Vitals separately for mobile and desktop visitors?

Accepted Answer

Real user data is collected per session, which includes device context, so mobile and desktop experience can be reviewed separately when diagnosing where a problem is actually coming from.

Question 5

Will a CDN or caching plugin automatically fix poor Core Web Vitals?

Accepted Answer

Caching can help TTFB specifically, but LCP, CLS, and INP are often driven by image sizes, third-party scripts, and layout choices that a cache alone won't fix — which is why tracking each metric individually matters more than a single combined score.

Question 6

How quickly will I see the impact of a performance fix in the data?

Accepted Answer

Once a fix is live, new real-user sessions start reflecting it immediately, though it typically takes a few days of traffic to see a clear, stable trend line rather than a single noisy data point.

Common questions

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