Well, the expensive part is to train the network. After that it should not be as expensive, depending on the size. If that is still not enough, they can also t

Well, the expensive part is to train the network. After that it should not be as expensive, depending on the size. If that is still not enough, they can also try to look at ways of producing a "good enough" effect with a smaller network. Then, it can also be limited to only some characters, the ones that you are more likely to pay attention to. Now, the MS Kinect does some intense processing behind the scenes (random forests) to capture your motion in real time. Yet you can still run games with decent performance. I think a neural network to adjust animations is not too dissimilar in terms of performance cost.