Add more RAM. When I was waiting for my refurbed iMac 27" to arrive, I ordered more RAM (through RAMJet) and installed it before first powering up the iMac. As with Win7, the more RAM the better. I wouldn't run less than 8Gb on either OS X or Win7.why are they so pokey? I click on something and nothing happens for a couple seconds and THEN the pinwheel starts. What's with that??