I never said it was realtime. I said it was acceptably fast on CPU ie. it'd take a few minutes/hours to generate some samples and convince yourself that they di

I never said it was realtime. I said it was acceptably fast on CPU ie. it'd take a few minutes/hours to generate some samples and convince yourself that they did not cherrypick a tiny handful of good quality samples out of a universe of lousy ones. I would very roughly guesstimate their 2000px model probably would take ~0.5s/frame on a GPU, so multiply by the usual >10x CPU slowdown, you can generate a 30fps 30s snippet in maybe an hour or so.