sorry for my bad English,English is not my mother language.
amazing dense grass is my personal mod which make grass more dense and lost min fps.
This one does not changer any texture and mesh,so you can use other grass texture or mesh.
This one does not contains any scripts,so it is safe for your PC and savegame.

setting 
Set the dense in your skyrim.ini file.
[Grass]
iMinGrassSize=80
if you want more denser,you can set it a lower number,but i think 80 is enough.If you need performance,i think 120 is a good choice,or you can set it higher.
my screenshot use iMinGrassSize=80.
if you think main file is lost much fps,you can use amazing dense grass-light,but this one is sparser than main file.
if you are using sfo,you can use amazing dense grass-SFO,i think iMinGrassSize=120 is a good choice.If you need performance.you can set it higher.

load order
if you are using SFO or other mod which change grass,this one should after them.





This is with SFO and Josh Ezzell's Unique Grasses.
iMinGrassSize=120,yes,it is just 120.