Nanite Tesselation on a large landscape?

Im trying to do tesselation on a landscape that is large. But everytime i try it crashes unreal. Any options? Alternatives?

subdivide your landscape.

Seems to work when i hide all streaming proxies and just load in and select the ones i want to generate nanite tesselation on. Save… then move on to the next proxies while unloading hte previous ones.