Internet connection suddenly slow for iMac but OK for iPad and iPod

A few days ago the WIFI internet connection on my iMac suddenly became so slow as to be unusable. However my iPad and iPod Touch on the same network still connect as normal. I have tried everything I can think of together with some ideas posted on various forums, including the following:
Rebooting and reformating the router - a Netgear DG834G v2
Connecting the iMac to the router via ethernet cable
Trying different channels on the wireless network
Altering the physical position of the router
Using Disk Utility to repair the hard drive on the iMac
Using Disk Utility to repair permissions on the iMac
Disconnecting the two external hard drives (one used for Time Machine) in case they were affecting performance
Running anti-virus software on the iMac and deleting any infected files
Disabling the anti-virus software
Deleting the network location on iMac and creating a new one
Trying different DNS servers including 208.67.222.222 / 208.67.220.220 and 8.8.8.8 / 8.8.4.4
Removing Skype from the iMac - the application my daughter was using when the connection suddenly became slow
Trying to browse in both Safari and Firefox
Resetting caches on the iMac
Rebooting the iMac after trying all the above
Swearing at the computer
Pulling my hair out!
None of these have made any difference. Sometimes when I reboot the iMac the first page I browse to loads reasonably quickly but then it immediately slows to a crawl again. The iPad is still connecting perfectly so I don't think it's an issue with the router.
The iMac is a 24-inch 2.8 GHz Intel Core 2 Duo with 4 GB 800 MHz DDR2 SDRAM
Running OS X 10.7.5
The hard drive has a capacity of 320 GB with 62 GB free.
I'm at my wits' end trying to sort this out and don't know what else to try.
PLEASE HELP!

Hi BDAqua,
In Disk Utility the disk is listed as S.M.A.R.T. Verified and comes up with no errors when checked.
Activity Monitor: with no other applications open Activity Monitor itself is using the greatest percentage of the CPU at approx 3%. Opening Safari and trying to load a web page initially used about 20% but immediately dropped back to less than 1%.
Whilst trying to open the web page I noticed on the Network tab that the Data received/sec is generally between 0-20 bytes/sec, sometimes jumps to a couple of hundred bytes/sec and very occasionally peaks at about 1,000 bytes/sec. Data sent/sec is generally mirroring data received.
Free RAM is at 2.5 GB and free disk space is just short of 63 GB (out of a total capacity of 320GB).
In Console I am getting the following messages:
usbmuxd: AMDeviceConnect (thread 0x100781000): could not connect to lockdown port (62078) on device 6 - d81bda1a752c658f30b839f53ca2fdb6a55f4816: 0xe8000084
usbmuxd: _AMDevicePreflightWorker (thread 0x100781000): Pair worker could not connect to lockdownd on device 6: 0xe8000084
com.apple.usbmuxd: stopping
com.apple.usbmuxd: usbmuxd-296.4 on Dec 21 2012 at 16:11:14, running 64 bit
In the System Memory tab of Activity Monitor - Page outs : 0 bytes (0 bytes/sec)
Thanks for your help. It's really appreciated. By the way, it's taking me forever to type all this on my iPad!

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