Some people have a very simplistic view of performance. They base performance on swiping the home screen back and forth but don't touch upon the more important things like, for example, browser scrolling performance. On an old 2012 Note II I can scroll through long live blogs like WWDC in a fraction of the time it takes on an iPhone 6.
I'm on Galaxy Edge S6+ now. It seems fine to me. I don't really install much on my phone's and don't care to. In fact I tend to use them as little as possible. I occasionally use the Web for quick stuff if I don't have something more powerful handy. I check E-Mail and don't install many apps. In three pay I used to root phones and change ROMs. I was always having to fix shit and change ROMS and my phones seemed less than reliable after doing that. I stopped doing that shit on my S4 and never had any problems. I just used the phone and it served me well.