It has to do with frames per second. There weren’t any standards back then and the numbers of frames per second were less and in many cases, variable because they were filed by a hand cranked camera. Because of this, films varied from around 12 fps to 16 fps.
When sound was added, they standardized on 24 fps. Since things were now mechanically locked to 24 fps, when playing older film on the same this equipment, everything is sped up by 8 to 12 fps making everything move faster.
It it possible to adjust the fps to make them look more natural if wanted but it’s generally not worth the extra effort.
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