Painfully slow internet after upgrading to Snow Leopard

hi all, i recently upgraded to Slow leopard.
My internet has soon become painfully slow, taking (literally) minutes to load pages. I have checked my modem & router, they seem to be fine as my iPhone & Vista laptop run perfectly on the same network.
does anybody know what this could be?

If you have not done so since upgrading to Snow Leopard, you should run Disk Utility and use +Repair Disk Permissions+.
Have you used Software Update to apply Apple's latest updates after upgrading to Snow Leopard. If there are updates, you should run it a second time to ensure there were no dependent updates.
As a test, you can create a new admin user account in System Preferences Accounts pane.
http://docs.info.apple.com/article.html?path=Mac/10.6/en/8235.html
Log out and log in to the new account. Try the things that caused the problems. Is it fast in the new account, or is it the same? If it is fast, then the cause is likely to be in your normal user account. If it is the same, then the cause is likely to be with the overall system (the OS).
You can also try doing a Safe Mode startup
http://support.apple.com/kb/HT1455
This will do some maintenance during startup and also load only Apple's essential system extensions and processes. Any third party software you have installed will not automatically run. Check the performance while in safe mode, and if there is improvement, restart normally to see if the problem comes back or not.

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