Changes

*Less than 20 ms [[motion-to-photon latency]] - less than 20 milliseconds of overall [[latency]] (from the time you move your head to when you see the display change). *Fuse optical tracking and IMU data -  *Minimize loop: tracker → CPU → GPU → display → photons.<ref name="OC2014 Iribe">Oculus Connect 2014: Brendan Iribe Keynote</ref>