If you are blessed with the good fortune of already having a VR headset and happen to be running an NVIDIA GPU then there is a new driver you want to grab as soon as you can.  The driver includes a new OpenGL extension that enables NVIDIA SLI support for OpenGL apps that display on an Oculus or Vive.  NVIDIA's PR suggests you can expect your performance to improve 1.7 times, not quite doubling but certainly offering a noticeable performance improvement.  The update is for both GeForce and Quadro cards.

They describe how the update will generate images in their blog post here.  They imply that the changes to your code in order to benefit from this update will be minimal and it will also reduce the CPU overhead required to display the images for the right and left eye.  Read on if you are interested in the developer side of this update, otherwise download your new driver and keep an eye out for application updates that enable support for SLI in VR.