🦿 Lucian Marin Metal for Mac is so good. I have opened 15+ windows. Everything is rendered at 60 fps on a Retina screen. Even so, I like to turn off translucency. People who got a 12-inch MacBook shouldn't have any performance complains. El Capitan feels a lot like Mavericks to me.

Mark Dain "Feels like Mavericks" -- That's encouraging to hear, especially as it's a beta!