Comment by Eric_Gullichsen

Frame rates were low because of limited rendering speed and tracker lag. I did a lot of VR demos starting in 1989 at Autodesk. Not much motion sickness, perhaps 2% of users. The first HMD we used at Sense8 was by Virtual Research (Bruce Bassett) with LEEP optics. And I just found out that John Ternus worked for Bruce. Small planet.