I personally don't believe it is worth the risk of rooting a Note 5 unless you will be using root specific features such as custom roms and other stuff like that. The performance of the Note 5 is satisfactory for most users out of the box. For battery life lowering brightness helps a lot, also the power management settings built into the phone help quite a bit such as slowing down the cpu. Another tool I found in the google play store is an app called "Greenify" which closes all the background apps using memory which saves lots of battery and data (which is important if you don't have unlimited data and are not on wifi). An issue lots of people report with the Note 5 (as well as s6, s6 edge+) is the standby time. If you have wifi enabled during standby it drains battery for some reason. The solution for most people was just disabling wifi over night to save battery. Hopefully Samsung will come up with a solution very soon as android 6 gets rolled out this month for the Note 5.