title: Change Unity terrain resolution without losing the terrain
body: <p>I have a really complex terrain in Unity, its full of trees, grass, flowers etc.</p>
  
  <p>When I run the game, the frame rate is really low, maybe 1 to 3 fps.</p>
  
  <p>I read some where that the terrain resolution may be the problem since i got it cranked up high.</p>
  
  <p>When I try to lower the terrain resolution, unity erases the whole terrain, which is bad since I can go spending two months to remake it all over again.</p>
  
  <p>Does anybody know of a way to change the resolution of the terrain, and other terrain parameters without losing the whole terrain? </p>
  
  <p>Maybe there is a script in the unity asset store that can export the terrain and lower the resolution, and re-import it, or something like that?</p>
  
  <p>Anybody know of script or method to do that? I don't have time to develop a script myself, or spend huge amount of time on this.</p>