The cable line that services your house is shared by many customers. When few customers are using it, your speed can be very fast. However, in the evening, when many customers are tapping into the stream, it slows down, and everyone gets slower speeds. DSL (like Century Link uses) has a different system. You get a dedicated line that never varies much. However, the speed you get is dependent on how far you are from the DSL station. If you are a long way away, your speed can be much slower.
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