Just to put this in perspective. 4k resolution is roughly 4x as demanding as 1080p. A lot of games run at 30 fps (especially on consoles) but most target 60 fp

Just to put this in perspective. 4k resolution is roughly 4x as demanding as 1080p. A lot of games run at 30 fps (especially on consoles) but most target 60 fps. If we want to do 4k @ 120 Hz, we are talking about 8x as much work. Rendering the scene twice (once for each eye) also adds quite a bit of overhead (lighting, etc.) and so that's a least a 2x factor. We are now looking at roughly 16x as much work. That is a very rough estimate but it gives a good feel for how much more processing is required to render the same scene in VR.