Instrument-without-delay and real devices

I am running tests on real devices and I noticed the test runs slower on the iPhone compare to the Android device.
I have Xcode 6 in combination with iPhone 6 Plus that’s running iOS 8.1.

My question is, does instrument-without-delay only work on simulator? On real iOS devices there will always be a 1 second delay?


Anyone knows about this?

I asked a similar question on this forum.
So far it seems that there is no way for instrument-without-delay to work on real iOS devices.

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But then how do companies like Amazon, Google, and Facebook get rid of the delay on real iPhone devices with their own test rack?