Poor 3D widget performance in 4.17 Previews

Anyone else tested 4.17 and noticed that 3D widgets are performing very poorly on GearVR? I created a answerhub post here: [GearVR] 3D widget performance degregation in 4.17 - XR Development - Unreal Engine Forums

Really hoping that it does not stay like that in 4.17 as it would make most GearVR projects un-usable. Would be great if anyone else using largish 3D widgets could confirm they are seeing the same?