Why is my mac internet slow and iphone fast, when both are running through the same router?

Hi
I have tried all sorts to fix this. The obvious resetting, rebooting etc of the router. I have spoken to my provider and stuff.
My internet on my iMac is terrible. I turn off wifi and back on and it works for about 20 seconds then stops. Very intermittent and hardly ever fast.
My iPhone however loads pages and apps that use the internet instantly. I am sitting at my computer so i cannot see why there would be a difference!
Its making my head hurt
HELP

Use the 5GHz Band Compared with the 2.4GHz band, the 5GHz band is practically empty. The newest AirPort Extreme Base Station is one of the few Wi-Fi base stations designed for home use that work in that 5GHz band. All of Apple’s Core 2 Duo laptops and iMacs (except the discontinued 17-inch 1.87GHz model) can also use the 5GHz band; with the build-to-order wireless option, so can the Mac Pro.
To switch to the 5GHz band, launch AirPort Utility, select your base station, and switch to Manual Setup. Click on the AirPort button and select the Wireless tab. Select 802.11n Only (5 GHz) from the Radio Mode pop-up menu. Click on the Wireless Options button and select Use Wide Channels. Click on Update to restart the base station.
Currently, no Mac-compatible adapters enable you to use the 5GHz band in older Macs or with older versions of OS X.
WiFi update 10.7.3
http://support.apple.com/kb/DL1501
Apple DNS Servers:
208.67.222.222
208.67.220.220
Wireless Improvements
Move the Base Station If interference is particularly bad in one part of your house or office, move the base station to another location. But this can be tricky if your AirPort base station has to connect to the broadband feed coming into the house and that feed happens to enter at a particularly interference-prone spot.
I have no way of testing some of these Firmware updates, read through them and see if any might apply to your system.
http://support.apple.com/kb/index?page=search&src=support_site.home.search&local e=en_US&q=keyboard%20firmware%20update

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Why is my mac internet slow and iphone fast, when both are running through the same router?

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