said by juking 
:said by GeekNJ :Every time your cable modem connects to Comcast, it downloads what is called a config file. This config file specifies a bunch of info but for your specific question it contains the caps (max speeds) for your upload and download. That is primarily how it is done.
I wonder if I can expect them to play games in order to get me to buy. I'm happy with my speeds already.
That would be illegal I think. Purposely degrading your performance in hopes you upgrade to a higher tier? No, they shouldn't do that.
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