If you've used the Galaxy S6 or the S6 edge for any appreciable amount of time you'd have noticed by now the phones have a habit of aggressively closing apps in the background even when there is no real shortage of system memory on the devices. This means, every time you go back to an app after a while it loads again instead of just quickly resuming state from the time you left it.
Unfortunately, having even more RAM seems to have not made any difference to the behavior, as both the new Galaxy Note5 and the S6 edge+ do the exact same thing. As you can see in the video above by Android Police, the Galaxy S6 edge+ is much slower at resuming apps than the older Nexus 6 and also doesn't resume state as well. The same behavior is reported seen on the Note5 as well.
The exact reason for this is still unknown. While there is the theory that this could be done to save power, the problem is having to start apps from scratch every single time the user requests them instead of just pulling them from memory uses a lot more CPU cycles, so any power saved by removing the apps from memory is nullified and it's likely the end result is greater power consumption. Samsung would definitely have a better idea as to what exactly is happening here but it's unlikely the company will comment on the matter.