Textures appear grainy from a distance during movement

[Acies]

As you move further away from your models the screensize of them become smaller, ergo there is fewer pixels available to describe their look. Mipmaps might actually help, as 'the grainy' look is probably from a messy/detailed texture (which looks okay up close) but grainy from a distance. Keeping it at full resolution instead of 'blurring' with mip maps might hurt the look.