Why Internet (Safari) and Comcast High Speed at odds with each other?

I have Comcast high speed internet and I am paying for the upgraded speed.
problem is, Comcast and my computer don't speak very well to each other and there is a MASSIVE slow down on the internet.
The Comcast guy said there is some "patch" I can download and make these two finally get along.
What am I looking for? HELP!!!!

You're welcome. I'm so glad the advice here helped!
...they said it was a Mac issue since no one else in my neighborhood was having the problem. Oh and clean out my cache files.
When I've had this problem with Comcast, it has affected both my Mac and my PC. With that and other things I've learned about this problem, I'm not sure I'd believe what the tech told you.
Why does it happen on some Macs and not others?
I'm not certain, but since the problem is apparently caused by something in the process of dynamically feeding you the necessary DNS addresses, there are several possibilities. In some cases, it's probably related to what Comcast market you're in (and therefore what Comcast DNS servers you're using). It might have to do how the Comcast-provided modem passes the addresses on. It might have to do with ones router (if you have one) and whether it's passing on the DNS addresses to the computers in your house properly. And it could also have something to do with issues with the particular computer, although my own experience with 3+ computers in my house (1 PC, 2+ Macs) indicates this isn't the situation, at least in my case.
There are a lot of factors in this. The only thing I know for certain is that it affects many Comcast customers across the country and that for many of us, only using alternate DNS addresses solves the problem. Talking with people more knowledgeable about these things than I am, I gather that this is a widespread problem that Comcast does not address very effectively or helpfully. :-|

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How Do I Help Apple US & Apple Europe Stop Warring With Each Other And Fix The Problem They Created?
PROBLEM
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BACKGROUND
My iPhone 5 (A1429 CDMA model) was purchased this year in September on an existing Verizon Wireless (VZW) line using an upgrade. The purchase took place in California and the product was picked up using Apple Personal Pickup through the Cerritos Apple Retail Store. I will refer to this phone at my "original" phone.
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Repair ID ----------- (Nov 15)
Repair ID ----------- (Nov 16)
Repair ID ----------- (Nov 16)
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SOLUTION
AppleCare US and AppleCare Europe need to resolve their internal family issues without further impacting their customers.
Apple is to process a refund to my credit card for the cost of a full retail priced iPhone 5 64GB black.
DESIRED OUTCOMES
I have an iPhone 5 (A1429 CDMA model) that works in the US on VZW as it did before I received the replacement phone in the UK.
Apple covers the cost of the solution because I did not create the problem.
Apple resolves their internal issue without costing me more time, energy, or money.
This becomes a case study for AppleCare so that future customers are not impacted like I have been by their support system.
Does anyone have recommendations for me?
Thank you!
<Edited by Host>

Thanks, but I've been on the phone with AppleCare US (where I am and live) and AppleCare UK. They continue bouncing me back and forth without helping resolve the problem.
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Why Internet (Safari) and Comcast High Speed at odds with each other?

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