Mathematically automated about 50% of my roto’s

I was spending a huge amount of my time rotoing shots.  I think this is fairly common in vfx.  So for every 8 hours of rotoing I now do a job overnight that takes about 10 hours (about 1 hour per every 10 seconds of a shot).  It looks a lot nicer, plus will speed up the production of my entire movie by about 30%.  Is doing some serious GPU cuda math with overlayed motion vectors and time differencing.