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WebPagetest Forums - how to choose between mobile options

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On http://www.webpagetest.org what is the difference between these two options for testing on a Nexus 5 using Chrome?
  • choosing "Nexus 5 - Chrome" under the "Browser" dropdown versus ticking the checkbox "Emulate Mobile Browser"
  • selecting "Nexus 5" on the "Chrome" tab under "Advanced Settings"

Is the first case running the test on a physical device, and the second running it on an Android emulator?

Thanks
Nexus 5 - Chrome is a real Nexus 5, the emulated mobile browser is desktop Chrome emulating mobile viewport characteristics.

The desktop Chrome emulation is likely to be faster than a real mobile device but will churn through tests faster, and of course is available in more geo-locations
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