I noticed issues with lag on my Verizon Note 4. I tried changing the animation in the developers options to 0.5x but not sure that helped much. What seemed to resolve the issue for me was going into S Voice settings and turning OFF Voice Wake-Up. Open via the home key was already off. This seemingly made a huge change but it's only been a few days. I also played with "Force GPU rendering" but not sure if that helped much or not yet. Let me know if this helps anyone.