Option to save loaded grids

I find it is ugly when your structures disappear into the void as you walk away from them. I was thinking what if there was an option to save the already loaded tiles during the session for those who have the ram to do so. Maybe have a slider to choose how many tiles away you want to keep loaded. Of course you wouldn't be able to see dynamic changes in those far off tiles, but at least your structures wont disappear and it would be easier on the eyes.