the reason galaxies spin faster than their mass should let them is gravity makes time move faster from our point of view or all the stars are pulling on each other while they spin around the center.
near the center of the galaxy there isn't a black hole but it's just the common point of gravity that the whole galaxy spins around. this also makes the gravity there very dense making time move faster from our point of view so stars closer to it move much faster in relation to our point of view. If we were orbiting one of those stars the rest of the galaxy will be moving too slow.
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