Which pages feel slow to visitors?

Open the page load or Core Web Vitals reports to see where visitors wait. Core Web Vitals describe when the main content appears, how quickly the screen reacts, and whether it shifts unexpectedly. Start with a busy page and filter by a device type. A small preview test checks collection, while meaningful performance comparisons need real traffic.

How can you check whether a page sends a measurement?

Use an isolated preview with a separate Web Analytics site and only sample pages. Confirm the preview uses the test site’s snippet and that the preview loads no live records or production analytics. If you cannot confirm that, inspect the HTML and site settings without opening the preview.

Register the preview and install its snippet
In Web Analytics, add a site using the actual disposable preview hostname, the address between https:// and the first slash. Use that site’s setup and check that the preview loads its snippet once. Sites hosted elsewhere can add the snippet manually without moving their domain.
Check the browser request
Open the sample page in a regular browser with the Network panel recording. Load the page and switch tabs. Look for the measurement request to a path ending in /cdn-cgi/rum, which is where the snippet reports.
Check the correct report
Select the test site in Web Analytics and look for the sample page in the relevant time window. The browser request shows an attempt to report. If the visit does not show after a few minutes, check whether the browser blocked the request. Compare the actual preview hostname with the one registered in Web Analytics and check that the preview is using that site’s snippet.

Can it count when someone finishes checkout?

Web Analytics documents no custom events or UTM campaign tags. It receives browser measurements and does not include every request handled by your server. Cloudflare describes this product as not tracking an individual across its customers’ sites and says it does not log URL query strings. Keep private values out of page paths as well.

How long can you see the numbers, and can you keep them?

Cloudflare offers Web Analytics for free and documents six months of dashboard history. Its limits page lists 10 sites per account for sites whose traffic does not pass through Cloudflare. It may sample records when building a report or API result. For scheduled reporting, a developer can query grouped browser performance data through Cloudflare’s GraphQL Analytics API and save the resulting summaries. That is a way to keep a report, not a download of each visitor’s history.