Holy mother of God. If you try to watch the new iPad Pro video on Apple's website using Safari on your rMB -- or even if you try to view the iPad Pro's webpage -- it will practically lock up your rMB. Want even more pain? Try to watch it full screen. Holy crap. I wonder if this will improve with El Capitan. I'm running Safari 9.0, so maybe that's part of the problem, but it's pretty bad regardless.