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)

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758217
https://fogbugz.unity3d.com/default.asp?758217_k9cc78g34qmih2fj