Running 64GB Note 5 on AT&T with Nova Prime running the Tersus theme.
I have disabled or uninstalled all the AT&T functions I could and about half of TW.
It has resulted for me in a very stable, fast, smooth and quick set.
I recommend anyone who wants to try this out.
I did take the time to go through all of the Nova settings to find what worked / looked best for me.
btw: I have turned on Android Developer Options and have disabled animations. Found them tiring after a few days.
As a side note, I also use an iPhone 6S+ and my Note 5 with this setup runs rings around the 6S+.