system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the action in old silent movies seem so fast?
gpt
They were usually recorded at around 15fps. When you watch them now digitally, they have to be converted to 24fps or 30fps. 24fps only became standard when audio was introduced, as 15fps was too choppy for lip sync.  
  
Even most animated tv shows are 12fps-15fps, as their is no fluid movement in the lips, and it saves a tremendous amount of time and money.