"Also, r.i.p. my old macbook air 2011 :-/" macOS performance was already getting so poor on 2010/2011 MacBook Airs, so I think this is the right move. I recent

"Also, r.i.p. my old macbook air 2011 :-/" macOS performance was already getting so poor on 2010/2011 MacBook Airs, so I think this is the right move. I recently downgraded my old 2GB 2010 MacBook Air back to 10.11 El Capitan and it runs much, much better than it did on High Sierra.