You can customize the details of the devices used to test your site. For example, you can set up a device that closely resembles a typical customer.
Four devices are configured by default.
The Mobile and Desktop devices match the settings used by Lighthouse and PageSpeed Insights. Note that there may still be difference in performance metrics in different environments.
|Name||Bandwidth||Round-trip time||CPU throttling|
|Mobile Fast||12 Mbps||70ms||2x|
|Desktop Fast||100 Mbps||2ms||1x|
To modify the default devices, or create new ones, click the gear icon next to the device dropdown when configure a new page.
Either edit an existing device or click Add new device.
This setting limits how much data can be transferred per second.
When running a test each network packet will be held back for this amount of time.
This is either Mobile or Desktop. The form factor affects:
|Form factor||Size||Device pixel ratio|
Set a custom user agent header.
This setting slows down code execution to simulate a device with a less powerful CPU.
Don't register service workers. This can make it easier to test page performance if your service workers make a large number of requests to prefetch additional resources.
This option installs uBlock Origin on the test device.