Different Internet Speed Packages

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Over the past few months I have noticed a difference in internet speed on my computer. Today I was looking at the Time Warner internet packages and found out that they have two different internet speed packages. I use cable modem which should be fast enough (or at least I think it is).

Time Warner is showing that they have "High Speed Internet" option or a "Turbo Internet". Both include a cable modem. The High Speed will reach to 10mps. The Turbo can get speeds up to 20mps.

Now I use the High Speed Internet option but it does not have a consistent download speed when I try to browse the web or even check email.

Do any Time Warner internet subscribers notice a difference between these two packages?