Article sez Carmack's first big fight was convincing Samsung that a two frame delay was too long. WAY too long. And it was important enough that he wrote an "obscene workaround" to avoid that "pretty short" latency.

I've been casually following Carmack & Occulus for a while; recurring theme is "X ms delay is too long". IIRC (corrections please?), wasn't until latency got down to 20ms that the nausea etc subsided. That doesn't leave much room to both render a high-res complex image and display it by anything more than the shortest transmission time conceivable.