So when I got my 2015 rMBP rather maxed out mind you, I decided to commit to Safari as anyone here will tell you Chrome is a resource hog don't use it yada yada. Well Safari after eliminating plug-ins etc still coughs and hangs daily. Slowly each time this happens I end up back on Chrome. Disturbing Also the UI of Safari leaves little to desire FOR ME. I'm shocked that in 2015 quitting Safari with 4 or 5 tabs open to get rid of hang kills the open tabs on restart.