I am using Macbook Pro early 2015 2,9 ghz i5, 8 GB RAM and 512 GB SSD. I am still thinking about using Parallels on it for only one program which I need at work. I am not a big fan of my current business laptop. Everything looks great to buy Parallels but I want to be sure that it will be working well. Especially if we talk about RAM. This window's program (Subiekt GT if someone wants take a closer look-polish program) takes only 9-10 mb of RAM on Windows system. In requirements they wrote that you need 1 GB Ram for it. So that is not too much. Still 7 GB will be available. Apart from this I will be using same things like on screenshot. Maybe 3-4 more cards in Safari. I know that macOS uses ram as much as possible. Usage bar is still one green so maybe after add Parallels still will be on green side. How do you think?