Doing science. Video on the left and video on the right were done with everything exactly the same except:
>without CausVid & 20 steps: 335s
>with CausVid strength & 10 steps: 252s

That's 3/4 the time for as far as I can tell exactly the same output.

CausVid strength is low - 0.25.

Video is 61 frames at 12fps and 576x432.

Next I'll probably start knocking steps off of the CausVid gen until I see a difference there, and then probably fiddle with CausVid strength.