All the high-tech animations in movie theaters these days might look perfectly simple, but the facsimile of realism achieved by modern animation is a result of attention to details like the slight visual blur created by moving objects.Historically, creating those blurs with computer programs has been an intense process computationally because of the amount of factors and data that computers need to process in order to render those blurs.
This is a companion discussion topic for the original entry at https://talkingpointsmemo.com/?p=110678