When early non-fiction films are transferred to digital media (and previously to analog video media), the movement of the subjects often appears to be too fast. It is often assumed that it is just in nature of early film to be like this. In fact, it is only too easy to become so accustomed to this accelerated movement that one no longer notices it.
But this effect usually arises because in making the transfer from film to video, insufficient compensation has been made for the fact that the typical frame rate in non-fiction film-making prior to the Second World War was 16-18fps, whereas the standard norm for video technology is 24-25 fps.
In effect then, the movement being shown in the digital transfers is often around 30% faster than it was in reality. Some video player apps, including VLC, allow one to adjust the speed of the playback to compensate for this, though this will play havoc with any voice-overs or music that might have been added at the same time as the transfer to video.