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UE 4.5.1 / SDK 0.4.3 direct to rift and hmd mirror off
With direct to rift mode do not use: hmd mirror off With "hmd mirror off" direct to rift mode does not work correctly, 0 FPS. With mirroring the direct to rift mode works very good here, 75 FPS, 1...
With vsync, if your frame takes longer than the display refresh time to render, the framerate must drop to half (and if even that is too long, half of that, etc). That is how all vsync works, not just in the rift.
Now, if your performance is borderline, maybe it only drops below the refresh rate occasionally, so the app isn't continuously running at half rate, so yes that could be indicative of just overall longer render times.
Now, if your performance is borderline, maybe it only drops below the refresh rate occasionally, so the app isn't continuously running at half rate, so yes that could be indicative of just overall longer render times.