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DebugBear Test Agent

Page tests are run using Lighthouse 12.6.0 and Chrome 137, on a headful Chrome instance.

View test configuration for lab test results.​

You can see the settings used to run each synthetic test at the top of the Overview tab.

Test result details

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 20 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_15_7)
AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/133.0.0.0 Safari/537.36 DebugBear

And this one on mobile:

Mozilla/5.0 (Linux; Android 11.0; moto g power (2022))
AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/134.0.0.0 Mobile Safari/537.36 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.

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