Slow Internet speed and more!!

I just got a Mac Book Pro (first one) and an airport extreme. I was told the setup for the airport was easy and I've got it working, but it seems very slow. I have two Iphones and a Dell PC on one network and the Macbook on an N network. At times the connection seems all right, but than it slows down. I'm 12 feet away from the airport and I can see it!!
I also have an Xbox 360 hardwired to the airport with no connections to Xbox live. I thought it would setup automatically since it is hard wired. Anyone have any thoughts?
In the time it took me to type this, it took my PC to load one internet page. That's like dial up!!!!
Thanks,
It's also taking 14 hours to download a cannon printer driver that is only 14mb, which doesn't seem right!!!!
Message was edited by: Medickep

Hello, thanks for your response.
I know it's a slow connection. As I said, I tried plugging through etherned and that's not the problem. Also as I said, I use this connection for normal web browsing on this macbook (this shouldn't be a problem in any OS or device). And finally (and also I mentioned it), the problem is only when using the MacBook Pro.
I have a couple of Android devices, an iPod Touch, a PS3 (where I play netflix movies) and I have no problem with all of them connected at the same time (and yes, I've tried connecting only the MacBook pro).
I don't want to 'speed up' my connection, I think this is not a normal behavior in any OS or platform, I just thought someone could know about "hidden" OS X proccesses or could have the same issue.
Thanks again for your response.

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    Switching from the TCP/IP pane to the PPPoE pane, if the isp connection settings are already held within your wireless router, which I think they most likely are, the "Connect using PPoE" box should not be checked. There would also be no need to have checked the box "Show PPPoE status in menu bar." If you make any change, again be sure to click the "Apply Now" button before leaving that preference pane.
    Now switching from the "PPPoE" pane to the "Ethernet" pane, check that the "Configure:" selector is set to "Automatically" and if any change is made, click the "Apply Now" button.
    Now switch the "Show:" selector from "Built-in Ethernet" to "Network Port Configurations" and drag the activated "Built-in Ethernet" configuration to the top of the list. Then drag the activated "AirPort" configuration to the position immediately under "Built-in Ethernet." Once again click the "Apply Now" button and that new setup is completed and activated. Your iMac will be connected to the router by ethernet and at the same time can use wireless to connect to a wireless printer or to another wireless computer.
    After both new setups are in place, I suggest to boot from your Install Disc 1, get past the first (language selection) screen, and (after fully loading) the second screen will contain a "Utilities" pull-down in the menu bar. Open and select Disk Utility. On the left side of the box, select the top-most drive shown, on the right side select "First Aid" and then click the "Verify Disk" or "Repair Disk" button. Allow to run to completion. Run a second time to be sure. Do not run Disk Permissions Repairs, but instead quit the installer version of Disk Utility, quit the installer process, and restart to your usual startup disk, which you can re-select using "Startup Disk" also located in the "Utilities" pull-down where you found Disk Utility. After restarting, Repair Disk Permissions in a similar manner after opening the version of Disk Utility located in your Applications>Utilites folder.
    Please don't hesitate to let me know the results of the above series of recommendations.
    However, if all that doesn't make for some improvement, I'd think you'd want to check with your router maker's website (or the router supplier's website if it was supplied by your isp) to see if there's a firmware update that might be applied to your router. Such an update might help your router's encryption capabilities, or might provide updated Mac support for the Intel-based Macs.
    Beyond that, I'd be calling AppleCare for support with your connection, since you're still within the 90 days of AppleCare phone support that is part of your new Mac purchase.

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