If it doesn’t move that fast, it wouldn’t be called light. Light is actually part of something bigger that can move at various speeds (and can even decay very quickly). The component that move fastest is called light. You just don’t see the other components normally, because if it moves slower it has mass, and when it has mass it decay in strength, and in fact it decays so much that its range of movement is effectively less than the size of a proton.
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