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How to profile ?

I am a bit puzzled by laggy feel in the test scene on Gear VR. How can I check draw calls / tris count / fps and CPU/GPU timing while testing in Gear VR ? How can I check if async timewarp is on or off ?

Thanks.

You can use the UE4 Console commands to help track down some of this information. You can read more about all available Console commands from the following page.

Thanks, it works!

Is there a way dump the data into a log file? (at least fps values so I could find low/med/max value using spreadsheets )

Yes, you have to set up debugging over your Wifi.

https://docs.unrealengine.com/latest/INT/Platforms/GearVR/Debugging/index.html#wirelessdeploying&debugging