VR really slow in 5.4 (OculusWaitForGPU)

A couple projects that were running fine in Gear VR when built with 5.3 are now really slow on 5.4 b1.
The profiler shows that OculusWaitForGPU its taking 70-90% of the time.

This also happens with the VR Sample project from Unity. An empty project with only that asset, when deployed wit 5.4 b1 lags a lot, but when reverted to 5.3 runs smoothly. (Even the simple Intro scene its slow)


Submit a bug report!