I have an early 2011 13inch macbook pro (8gb ram, 128ssd) and I use it for programming. Mostly I run Atom/Sublime with some extra plugins, iterm2 with 4-5 tabs, spotify, google chrome with 10-15 tabs, Skype and Evernote. I want to run a virtualbox running Ubuntu, but my macbook pro fan already runs nonstop and gets too hot to use its builtin keyboard and little bit slower. I'm interested in buying 2015 model. How will 2015 model handle my needs? I'd be interested in only 13 inch model, since I get to carry my laptop here and there.