Miles Moves Slower Than Everyone Else
The film runs at the standard 24 frames per second, but a lot of the character animation is done on twos, meaning a new drawing only every other frame, which drops the effective rate to 12. Early in the movie this is used specifically on Miles, so before he's found his footing as Spider-Man he visibly moves with less grace than the other Spider-people, who are animated more smoothly.
