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This is Twenty Milliseconds, a site documenting what works and what doesn't in virtual reality design.

Low Frame Rates Cause Sickness, and It's Biting Academics

The good news: Academics are using the Oculus Rift to conduct studies into the effectiveness of virtual reality. It’s too common to see academic departments lag behind the cutting edge, especially in computer science. The bad news is, two recent studies couldn’t get great results because the participants were getting sick. On further investigation, both studies were using software that got low frame rates.

Low Frame Rates and Sickness

Do low frame rates cause motion sickness? The Oculus Rift DK2 is designed to present 75 frames to the user per second, roughly one frame every 13 milliseconds. A lower frame rate means that there’s an increase in time between an input (say, moving your head or pressing a button to trigger an action) and the corresponding update on the screen.