We did not aim to speed this part of NeRF up. Check out Neural Sparse Voxel Fields (https://arxiv.org/abs/2007.11571 https://arxiv.org/abs/2007.11571) for some

We did not aim to speed this part of NeRF up. Check out Neural Sparse Voxel Fields (https://arxiv.org/abs/2007.11571 https://arxiv.org/abs/2007.11571) for some effort in that direction. It's 10x faster, but there's still another 10x to go till you get video frame rates :)