Your latest version that adds chunks has rendered my high speed transit system useless.  Even on chunk base 4.  It does not render fast enough and stops me until it catches up.  I have put countless hours on this map building town after town with my boys and now its useless.  

I tried to go back to the original version (I did make a copy before) but it will not allow me to play that map without updating too.  What was the point of giving that option then? 

Please fix this.