I have a Macbook Pro from 2012. It has a 2.5 GHz processor, 4 GB RAM, and a 512 GB hard drive. I also use a 1 TB Western Digital My Passport external hard drive. I just upgraded to Sierra. Thought it had been done earlier, but apparently not. Being as old as it is, it is running slower than I would like. I have been deleting a lot of junk, but it isn't helping much. I was just wondering if I could, or should bother trying to changing any of the internal components? I really don't want to get a brand new computer right now unless absolutely necessary.