VR motion sickness, or simulator sickness, is a real symptom and a concern for virtual reality. Researchers, psychologists, and technologists with a wide array of specializations and PhDs are studying the problem to better understand the underlying causes and find solutions.
A cause of VR motion sickness is a lag in screen updates, or latency when you're moving your head. Your brain expects the world around you to change exactly in sync. Any perceptible delay can make you feel uncomfortable, to say the least.
Latency can be reduced by faster rendering of each frame, keeping to the recommended frames per second. Device manufacturers see this as their problem to solve, in both hardware and device driver software. GPU and chip manufacturers see it as processor performance and throughput problem. We will undoubtedly see leaps and bounds of improvements over the coming years.
At the same time, as VR developers, we need to be aware of latency and other causes of VR motion...