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max-ostapenko Jul 18, 2025
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Expand Up @@ -14,11 +14,11 @@ The HTTP Archive crawls [millions of URLs](https://httparchive.org/reports/state

## How is the data gathered?

The list of URLs is fed to our private instance of [WebPageTest](https://webpagetest.org) on the 1st of each month.
The list of URLs is fed to our private instance of [WebPageTest](https://webpagetest.org) on the 2nd Tuesday of each month.

As of March 1 2016, the tests are performed on Chrome for desktop and emulated Android (on Chrome) for mobile.

The test agents are run from [Google Cloud regions](https://cloud.google.com/compute/docs/regions-zones) across the US. Each URL is loaded once with an empty cache ("first view") for normal metrics collection and again, in a clean browser profile, using [Lighthouse](https://developers.google.com/web/tools/lighthouse). The data is collected via a [HAR file](https://en.wikipedia.org/wiki/.har). The HTTP Archive collects these HAR files, parses them, and populates various tables in BigQuery.
The test agents are run from [Google Cloud regions](https://cloud.google.com/compute/docs/regions-zones) across the US. Each URL is loaded once with an empty cache ("first view") for normal metrics collection and again, in a clean browser profile, using [Lighthouse](https://developers.google.com/web/tools/lighthouse). The data is collected via a [HAR file](https://en.wikipedia.org/wiki/.har). The HTTP Archive collects these HAR files, parses them, and populates [a public dataset in BigQuery](https://har.fyi/guides/getting-started/).


## How accurate is the data, in particular the time measurements?
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