Probably just the incorrect speed was provisioned on the cable modem account - a quick call to customer services will normally do the trick. Check your cable modem settings first though, goto
http://192.168.100.1 - have a look around in 'Operational Config' for something that says:
Quote:
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Maximum Downstream Data Rate : 2048000
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If the number is as above, your on the 2Mb service - it should either be reading 10240000 (10Mb) or maybe 20480000 (20Mb; note extra 0) if your area has been upgraded already.