Speed varies wildly.
But in my ignorance, I don't really know what the numbers mean in relation to the maximum speed the cable modem people talk about. They say the max upload speed is 128, so I don't know how I'm getting 304, unless I'm comparing different units of measurement. I still keep a basic dial-up account alive, for those times when the cable modem service is on the fritz. It's amazing but my IBS mail account is still up too. Sounds like they're wary of the courts to me.