YOu can "scale" the Textures, smaller...
Before u clicked on the "Apply" Button, klick on "Settings" and use the Scale X / Y Values to change the "resolution" on the BLocks

cYa Sebastian


Tutorials:
[Blender]Terrain creation ENG/GER
[Blender]Low Poly Tree Modeling
[GIMP]Create a Texture for Terrains
CLICK HERE