What are some animation techniques used to drastically reduce the number of frames in a video? I am thinking reducing the number of frames is the best way to drastically reduce production cost, so I am wondering what are some of the techniques used by the industry.

In old movies, they used to show newspaper spinning towards screen like this: Here is the example from The Godfather (1972):

I'm finding animation films about horses like Spirit. I've seen this movie many times so I want to see more. I love traditional animation but i've found only Spirit. Can you help me and find more animation films about horses (the main character must be horse)? Not live action, only cartoon (tradi...