My internet is slowing down - sometimes the whole computer does too......

Hi,
Is any one able to give me some advice with this?
My iMac is now about 18 months old. Over the past 4-6 months it has gradually got slower. I have noticed this mainly on the internet. Some days it takes about 3-4 minutes to load one page or can't even open it at all. It used to be fine (i.e. opened a page in a second or two) and there is the odd occasion where this is still the case.
A few facts about the comp;
Memory capacity 232.57gb
Used 62.69gb - I am confident that it is not due to lack of space on my iMac!
On the activity monitor it shows 2.73KB per second - no idea what this means
I have completed the Apple Hardware Test - came back fine
I have completed Repair Disk Permissions - didn't change a thing
I haved deleted all Caches, Log files and Temporary Items.
I have downloaded OnyX - my iMac will not allow me to open the programme though.
I do not use this iMac for much - dont download much, dont use many programmes - only internet and email really!
I have contacted my broadband provider who have confirmed I am signed up to receive 5mb and I get the full five. They have said I have a good connection as far as they are concerned. I have run a broadband speed test - download speed - 4152kbps - upload speed- 497 kbps
I connect to the internet wirelessly and the airport icon on my screen suggests full strength.
I have now run out of ideas as to how I can speed up my beloved computer again.
I'd be really grateful if anyone could suggest any further things I could do to fix this problem.
Please!!

I would assume based on your usage and problems that the issue is specifically isolated to your internet performance. If you almost exclusively use this machine for internet/email, then we're probably talking an internet throughput issue. And probably the issue is something with the wireless configuration.
If you can post more information about your configuration, that would be helpful. Who is your ISP? Are they providing a modem that has wireless built in, or do you have a wired connection to another wireless router? What brand of router are you using? Also, what brand of modem(if they are different)? Finally, what version of OS X are you using and are your Software Updates up to date?
Is there a way you could connect your computer via Ethernet directly to your ISP box to test your performance that way?
Finally, do you have any cordless phones, microwaves, or anything using the 2.4 or 5 GHz radio band nearby? Something like items above might be causing intermittent interference.

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Ok, look I know that there are some very informed computer techs here. That is why I came here to the Apple forums,,And what I want is the truth. Yes I want you to cough up the truth one of you tecchies out there who are familiar with what exactly in the 9e11 is going on here? The INTERNET has slowed down all accross the U.S.A.
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Message was edited by: moh2o

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