Performance animation question

So i have a file with all my land in it for a game my question is what is better do to and does it make any difference…?

so here goes is it best to put animated models (i have a few of them) into the “land model” and have that handle all the “background” animation or is it best to load each animation on it’s now and position them around the world to the correct points and each have its own mixer… which is best and best for performance or does it not better?

i’m guessing all in one file is best as it requires less code…?