A video is slowed down by replaying it at a lower FPS. If you could display 1000fps then it would be normal speed.
60 fps would be slow motion if you played it back at 1 fps, but then it’d be a slideshow. 1000 fps would be used so you could replay it at a lower fps but still see motion because it’s still a reasonable viewing fps.
Edited for clarity, hopefully.
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