Mac Mini 2009 massive slow down but only even 4-5 mins?!?

I have a issue where I get the spinning beach ball of death and it lasts for about 20-30 secs, but I get this every 4-5 mins
I have used CleanMyMac to remove all the crap and run all the cleaning and maintence tasks on Onyx to clear the computer up; to be fair it is kept very clean most of the time anyway.
I have checked the hard drive and corrected all permissions as well as verifying the drive itself.
I have run a Memtest 2 pass on the RAM and had no errors.
Both of these were done in single user mode from boot using the Terminal.
I am running a 2009 Mac Mini with a 2.6 Core2Duo, 6Ghz RAM, 160GB SSD drive. It is plugged in via the mini display port to an HD Tv and connected through the optical port to an amp for audio. I am using the wireless bluetooth Mac keyboard and Magic Mouse.
Any suggestions would be great

Thanks for the response by I have already gone through these processes and determined that there is no application or process filling the CPU cycles or RAM and that I have adiquete drive space and resources to do what I need to do.
I t seems to happen on everything; be it opening Finder or scrolling on a webpage or just clikcing the Bluetooth icon at the top of the screen. Just every few minutes I get the beachball. I can move the beachball around but not click anything or do anything.Then after 20 secs or so it is back to normal and as fast as ever.
However, 4 or 5 mins later ....

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