First, how many blocks do you have? Second, since you have 6.31 Pro edition (according to your profile), do you have the "high res" flag checked for the lighting for some of your large surfaces? Third, what are your build specs (as when just about to compile)?
"You level up the fastest and easiest if you do things at your own level and no higher or lower" - useful tip
My 2D game - release on Jun 13th; My tutorials
