The main problem with the 6+ for me was the inability to keep apps and browser tabs in memory. The 6S+ doesn't have that problem at all. It is better than every phone on the market for keeping things in memory, other than perhaps the Nexus 6 and 6P.
Hmmmm you make here a very good point my friend. Are you serious about that the memory better is then the Nexus 6/6p?
I think that the 2GB RAM is not enough.. I mean that you see some stutter or some frame drop if you use 3D touch on a app/press. I was today in the apple store and was some testing on the demo phones 6s+. And in the settings it was all off. The settings to reduce and transparent settings. And if you press 3d touch on a app its frame drops. Compare to the 6s.
I hope this not a hardware issue.