El Capitan was very slow and Sierra is even worse. I have the stock 500GB HDD and the stock 4GB of RAM and yes I know that upgrading these will help significantly improve my speeds but I don't have the money to invest in that right now. I did some cleaning out of the HDD a while back when it became almost unusable with El Capitan. I am almost to the point again where the computer is unusable and I need my Mac for work. Does anyone have any FREE suggestions to get this thing running a little better?