[Unity 5] Inconsistent frame rates in editor / build

In Unity 5 (every beta I've tried so far) with the Oculus SDK, I have an issue where the first time I hit Play in the editor, I'll have a low frame rate (somewhere around 60 - 70). If I stop and then press Play again, the frame rate will jump by 20+ frames per second. It remains at this rate every time I press Play after this for the remainder of the session.

If I close the editor and open it again, the cycle starts again. Low frame rate the first time I press play, high frame rate every time after.

The big problem is that this behaviour seemingly carries over into builds except that I can't 'stop and re-start' the game. I load it up and get the same low frame rate I have in the editor the first time I press play. There's seemingly no way to reach the higher frame rate.

I tried this with a normal camera and couldn't replicate the issue. It only seems to be present when using the Oculus prefab. It also seems to be consistent across multiple projects. I'm using Oculus SDK 0.4.4 but had seem the issue on earlier versions of the SDK.

Given how high the fps requirements are for VR titles, it'd be great if this could get resolved. As it is I can't hit the basic 75fps with this bug (however in editor I've seen frame rates comfortably in the hundreds on some projects after the first time I hit play).

Anyone else having this issue?