>>272805448
Not really. The desktop mirror for VR games is either just copied from the framebuffer that's going to the headset and cropped to one eye (basically free performance-wise), or the mirror is separately rendered from the headset (necessary if you wanted the view smoothed or third-person). Ideally you'd be able to turn the mirror off for maximum performance, but just cropping is free enough that I haven't really seen games offer disabling it completely.