After I went to the Apple store – see the report on that below – I took my iMac to Best Buy to get more RAM installed. RAM is the "working" memory of the computer. It's used to store data for programs, sequences of instructions, on a temporary basis.
I had two modules of 4GB each put in. Now, my computer is running faster.
The experience wasn’t without problems. At first, they took out what was in my computer and replaced it with two modules. The technician said the new modules weren’t compatible with the old.
But, I said, I have two slots left. Add two more modules.
That didn’t work. So the technician went back to my original modules plus the two modules of 4GB each.