need tips on how to make a large terrain run more quickly and not lag when scrolling in and out.

I will typically clip the terrain to the area I absolutely need and make sure I thin the points as much as possible. Then I will create a 2D drawing where I merge in the contours. And a 3D drawing with the terrain model and calculated features turned off. That way I can use the 2D model for drainage evaluation, etc. and the 3D model for modeling purposes. The 2D model with contours merged in still slows performance some but not as much.

Thanks Matt!!!!! That is exactly what I need to do!! Im creating drainage area maps and do not need the dynamicness of the terrain!

Thanks Matt!!!!! That is exactly what I need to do!! Im creating drainage area maps and do not need the dynamicness of the terrain!