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DebugBear Test Agent

Page tests are run using Lighthouse 11.3.0 and Chrome 119, on a headful Chrome instance.

Network throttling

Lighthouse tests on PageSpeed Insights or in Chrome DevTools load pages on a fast connection and then simulate how they would have loaded with a slower network.

In contrast, DebugBear throttles the network at the operating-system level and then runs the Lighthouse test, resulting in increased accuracy.

Server locations

More than 10 server locations are available.

IP addresses

You can run tests from fixed IP addresses to prevent DebugBear from getting blocked as a bot, or to exclude DebugBear tests from analytics.

Go to Account and then IP Addresses to enable fixed IP addresses.

Test devices

Settings like network speed and CPU speed depend on the device selected to run the test.

User agent

By default, DebugBear sends this user agent string on desktop:

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6)
AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/119.0.6045.159 Safari/537.36 Chrome-Lighthouse DebugBear

And this one on mobile:

Mozilla/5.0 (Linux; Android 7.0; Moto G (4))
AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/119.0.6045.159 Mobile Safari/537.36 Chrome-Lighthouse DebugBear

Note that the Chrome version is based on what's specified in Lighthouse, not the actual Chrome version that's used to load the page.

Differences to other tools and environments

Read this blog post to learn more about how different settings and environments can affect your scores.