Hi I know a bit about computers, not a lot though. I recently installed 8GB RAM, two 4GB slots on a 2010 MacBook Pro model. I have nothing intensive that I use running, no malwarem spyware or viruses, just Firefox and music and I've over 400GB left on a SSD. I don't understand why I haven't much RAM left there seems a lot being used for just using the computer and things run a bit sluggish. Here is a screenshot of a memory checking app showing what is being used. I mean what is using nearly 5GB of RAM?