Hi! My mid 2011 iMac has just recently started dipping in CPU usage and going very slow for a period of time, then back to normal. To fix the issue, I just reset the SMC controller by unplugging the iMac, and restarting it. The application thats using the most CPU is the Activity Monitor itself at an average of 2.5. Of course, after doing this every day, it gets a bit tedious. Is this a lack of RAM problem? Do you reccomend upgrading? I run a lot of high CPU consumption programs, such as rendering videos in Final Cut and high performance games. Thank you!