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DebugBear Test Agent Details

The DebugBear agent runs synthetic website performance tests by loading your website in Chrome.

Chrome and Lighthouse version​

Page tests are run using Lighthouse 13.5.0 and Chrome 154, 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 30 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 uses the user agent strings below to make requests. You can customize these in your device settings.

On desktop:

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7)
AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/154.0.0.0 Safari/537.36 DebugBear

On mobile:

Mozilla/5.0 (Linux; Android 10; K)
AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/154.0.0.0 Mobile Safari/537.36 DebugBear

Differences to other tools and environments​

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

Note on free tools​

Our free tools do not provide the same level of customization as our main product. However, you can detect them based on the user agent:

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