Upgrade for acer aspire 4315

Question

Sir I have an acer aspire 4315 and i want to make it faster so can i make it faster by any method it already has a 2 gb ram is there anyother method that i can do too make it even faster and i want to add an 250 gb harrddrive to it so which is the best harddrive and can i add a bluetooth to it and is there any software to increare the speed