Forgot to mention I'm on an iMac with OS 10.3.9 using Safari as my browser. Using a Motorola cable modem.
Just recently switched from DSL to Comcast cable Internet and noticed a slight increase in the speed of my Internet access. A week later I installed TiVo and have noticed a significant decline in the speed of my Internet access. Since both TiVo and my cable modem are constantly connected and "on" is this the cause of the decrease in speed performance? Am I imagining things? If there is a cause/effect, is there anything I can do about it?

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