I believe the new version is drawn in vectors and animated in Toonboom Harmony. The old cartoons were of course hand-drawn and animated, frame by frame. Back on topic: a higher FPS may be uncomfortable to look at as well: recall the Hobbit's 48fps format? Many moviegoers couldn't get used to it due to their brains being conditioned to seeing 24fps on large screens all their lives, and the amount of natural blurring which sort-of masks that low framerate. People said it looked "fake" and "too sharp", as if they were looking at a theater set. I think I read about similar sentiments when the first colour films were made. When I started to watch the Hobbit at 48fps for the first time, the thing that struck me most was how smooth the backgrounds panned. That sold me on the format, because I absolutely hate the jarred and blurred panning in movies. I love 48fps, but it seems it fell out of favour almost immediately due to the complaints of viewers while watching the Hobbit. If it were up to me all films would be recorded at 60fps.