HT1338 mac book slow internet connection

Hi all,
I just bought a new Mac Book Air but the internet connection is extremly slow. I did t/s with Apple care but they insist it is the wifi connection and not the device. I have two other PCs where this is not an issue and all phones in my home are working well with wifi. Can anyone PLS HELP! m seriously thinking of returning this thing.
Thanks!

Do you have cable, dsl, dialup or satellite service?
http://docs.info.apple.com/article.html?artnum=106748 Mac OS X: Troubleshooting a dial-up/PPP Internet connection
http://docs.info.apple.com/article.html?artnum=106749 Troubleshooting a cable modem, DSL, or LAN Internet connection
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
*If wireless:* Run the Airport Utility app which is located inside the Utilities folder.

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I've been dealing with a severely slow internet connection with my 2007 mac pro - dual quad core. I have os 10.7.3. I use wifi.
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HT1338 mac book slow internet connection

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