So I got a 15" macbook pro from mid 2010 that still runs snow leopard, and I am absolutely amazed about how nicely it's been running for all these years. But after approximately 7 years of use, i can definitely tell that it's starting to tire out.. and that it's time for an upgrade. I've been thinking of buying a new macbook, but i'm still very found of this machine and I can still pretty much do all my tasks on it, considering that I'm not an advanced user in the sense that I don't use heavy programs. But yes, it's getting old and more and more programs demand that i upgrade my operative system to keep using them. (F.ex Adobe Flash Player and Itunes). another thing I've noticed is that my macbook has started to freeze a lot more now. So this is what I plan to do: 1. I'd like to improve my macbook pro by: adding more ram and upgrading my hdd to ssd. I believe this would be essential for increasing performance and to make a new OS more compatible with this old machine. 2. I realize I have to upgrade my operative system, but which one should i choose?? I'm thinking about upgrading to Maverics, because i'm thinking OSsierra might be too energy consuming.. what do you think? I also realize that the older operative systems are no longer available, which really sucks, and therefor I realize I might have to Install OS sierra after all. summed up: so do you think upgrading from 4GB ram to 16GB ram, and swithing from hhd to ssd and installing OS Sierra (or Maverics) would be a good move?