Hello all. I am not very computer savvy and so was recommended to come here by my daughter. I have an old iMac (I believe I bought it in 2007/2008. It is running 10.6.8. It is 21", 2.4Ghz Intel Core 2 Duo with 3 GB of RAM. It's incredibly slow, despite having over 150GB free. I would prefer not to buy a new iMac and get this one up and running faster, but not sure how it is possible. Can anyone give me advice on how to maximise it's performance?