27" Mid 2011 iMac really dogs using Photoshop CC and Lightroom 5...

along with Firefox and Chrome always throwing up errors.
Processor 3.1 GHz Intel Core i5
Memory 8 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6970M 1024 MB
Software OS X 10.8.4 (12E55)
If I restart the machine things run lickity split for about 10 minutes, then it just gets continously slower to the point where some functions, especially using Color Efex Pro 3 and Perfect Portrait, take 5-7 minutes to perform. I've seen suggestions that it may be the graphics card, but this machine isn't that old. I've allocated 75% of my RAM to PS and it doesn't make one bit of difference.
If I have LR, PS, and Firefox open at the same time, shouldn't 8 gigs of RAM be enough for that? The thing that gets me is that right after a restart, as I said above, things move along right nicely, so I'm thinking it isn't a RAM issue.
I figured I'd ask here before calling Support. I didn't see quite the same issue when I searched.
Thank you for your help.

Thank you!
See if the Disk is issuing any S.M.A.R.T errors in Disk Utility...
http://support.apple.com/kb/PH7029
REPLY: None that I saw
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
REPLY: Nothing seemed out of the ordinary, for as much as I know, which is next to nothing. Java was the biggest load and jumped between 8 and 12%
How much free RAM & free Disk space do you have also, click on the Memory & Disk Usage Tabs.
I'm not sure how to check the RAM. Here are screenshots of both
Open Console in Utilities & see if there are any clues or repeating messages when this slowdown happens.
It looks pretty like this the entire way through:
In the Memory tab of Activity Monitor, are there a lot of Pageouts?
15.52 GB
Thank you for your help!

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daniirwan wrote:
baltwo: Thanks for your input! I didn't think of wiping the old HDD before sending it in for the replacement..all those sensitive user data! One question: What's a FWHD?
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