Unity Lag Issues

Hey everyone! I am making an mmo rpg and it was working great in unity 2 but i ported it to unity3 and now the stand alone lags like crazy even on good quality or lower wen i used to go on fantastic. all i added to the game in unity 3 were a few more trees 3 new houses shadows and a windmill none of witch are over 2000 polly most are not even 1000. the editor also lags but it always did please help

this isnt a solution but im learning unity fast and i just got unity 3 tonight so it would be nice 2 c omuni i can beta test till i get better with modeling :slight_smile:

What are your system specs, and what OS do you use?