Horrible slow down, only when downloading files??

Hi
I am getting terrible slowdown and the dreaded spinning wheel on my iMac, but only when I am downloading files using a web browser.
I have tried Safari, Opera, and firefox and the problem still remains. It only seems to happen when Im downloading more than one file. I have reinstalled Leopard, repaired permissions etc.
Im at wits end, because Ive tried everything. It takes about 10 mins after all downloads have been cancelled for the mac to start running properly, during this time it takes an age to do anything, open a new window or application, type in text, even clicking on a dock icon.
Any ideas would be appreciated.

How full is your hard drive? It sounds like it could be pretty full and if you have less than 20% or so free space available it will eventually start slowing down.

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