No Paddy I have not installed any of those. My HD in 500 GB. My iMac is a 2008 model an I have the ram maxed at 4 gig. I wasn't aware that was the minimum requirement for Maverick so yes that could be what I am seeing. Thanks for the information about the Activity Monitor. General use of the computer is fine. Just noticed a decline in performance on a couple online multiplayer games I use the computer to play. I closer out other programs before playing these games.Thanks, very helpful information!My computer information is provided under, My Mac info. The OS is outdated, I am running Maverick now.
While the official line is that this iMac is maxed out at 4GB of RAM, unofficially, it will recognize and use 6GB, so you may want to look into getting a 4GB stick of RAM. What are you seeing re: page ins/page outs in Activity Monitor? That might give you some idea of whether or not it's worth trying.
http://www.everymac.com/systems/apple/imac...nryn-specs.html
Also - you can update your profile to reflect the newer OS - click on "My Controls" at the top of the page. In the Personal Profile section, click on Edit Profile Information.