Performance drop in VR on Unity 5.2.0 and later

Build with Unity 5.2.0 and later versions have a significant performance drop from steady 75fps on Unity 5.1.3f1 to 65fps on Unity 5.2.0 and later.

Same scene, no changes - only difference is Unity version they are built with.

Running on Windows 8.1, Oculus runtime 0.7.0.0 beta (also tested 0.6.0.1 beta), NVidia drivers 356.04 (recommended for Oculus runtime 0.7.0.0 beta).