Perhaps why it is lagging is because at line 105 in the class Play, you have the following being executed every act cycle:
UserInfo.getMyInfo().getInt(5)
This retrieves data for the current user from the server which isn't as fast as it is when within the Greenfoot IDE
2014/3/8
Residents
2014/3/7
12-pce Rectangular Puzzle
2014/3/7
Tic-Tac-Toe
2014/3/5
Block Shirk - a "Simple Game"-Remake
2014/3/5
Block Shirk - a "Simple Game"-Remake
2014/3/5
Block Shirk - a "Simple Game"-Remake
2014/2/28
TextFile Viewing World Class
2014/2/28
TextFile Viewing World Class
2014/2/22
Forgotten Road