Compare a human walking to an ant walking, in terms of how many steps we take per second.
We’re “giants” too, and there’s your proof that bigger systems just need longer to move. Yeah a human can cover more distance than an ant, because our steps are 1000s of times longer than theirs – but it’s still physically impossible for us to take steps as quickly as ants can. Changing direction that quickly just isn’t physically possible. Heavier limbs have more momentum and the G forces needed to whip your legs around as fast as ant legs would damage our tissues.
Larger objects are relatively weak due to the square-cube law (see the other comments here); this means they can’t step as fast. They do have longer legs so overall they tend to move faster. Over a fairly wide range speed scales with roughly the square root of size but there’s a limit. Above a certain size fragility is a problem and speed actually decreases.
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