I just restored my old Late 2009 27" Quad core iMac, from Time Machine to a Late 2012 21" i5 iMac, and at certain points it is very slow and laggy. For example when I try to open Photoshop, or just randomly when I am on the browsing the Web using Google Chrome.
Nothing seems to be using too much of the CPU or the RAM, but maybe I need to do some kind of system clean. I already installed the newest OS which seems to have helped.
Can anyone please let me know what might be the best solution, or general steps which should be taken in this case.