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There could also be noise on your node which is the cable term for "local loop" you can usually check the S/N ratio in the cable modem by going to the internal web address on the modem (check the net on how to do this for the version of modem you are running).
99.99999% of the time when there is a speed performance issue with a cable modem it is due to noise on the forward or return path.
If you television has lost some of its clarity it may be noise on the forward if the S/N ratio on the cable modem is less the 30db then there probably is a return path issue.
Did you add any splitters to the cable which injects more noise into the system also decreasing the signal strength?
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