User blog comment:RealgrandpaJoeWCG/Your Detailed Place VS. My Detailed Place. HELP/@comment-25787643-20161011035939

Did you use any free models that might have duplication scripts? Is there an excess amount of smoke/fire/terrain/whatever?

I ran across a similar problem recently when I reverted a game to an older version I made a few years back. The game had a lot of bricks but the problem was that it was full of viruses and invisible fires.