Intuitively, fictional things are usually modeled after real life things, and are made in a way that instinctively makes sense to our mind.
So why would a giant human move in a slow manner? Well, because that’s how we tend to see *animals* doing it. Elephants are the biggest land animals, and they’re not exactly nimble. They’re even physically incapable to jump. This is not by chance: as someone else has mentioned, it’s the result of the square-cube law, which means a bigger animal would be proportionally to their size less strong than us, and thus will be less fast and agile. So a real-life giant would indeed be pretty slow and clumsy.
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