Another maybe stupid question:

I never used the paths in EE, and I don't intend to ever. Is there a possibility to prevent the Editor from building the paths every time? It takes ages compared to building the terrain, at the moment even crashes the editor with my current project because it runs out of memory when I try to build my world (its a 2048x2048 Heightmap with a 128m Areasize containing 32 Heightfields each), and as I don't use it, I'd like to just switch it off.

Any ideas how to do that?

There isn't option to switch it off, but you can set parameters to minimal values in "Path Settings" window.
I think "Cells per Meter" should be near 0.

Okay, that solved the crashes. And I learned again some new functions in the Editor

Thanks for the quick help!