The first thing I thought of when I saw Unity's terrain editor was "open world." However, after having imported meshes created in blender into scene - a town located on an island across a bridge - the scene is going really choppy and slow.

The meshes are, for the most part, unfinished rapid prototype placeholders - actually less complex than the finished are to be.

For virtually all meshes, I've placed simple box colliders. Yet, the scene is running choppy and slow - and thus far all I have placed are fence meshes, a few prototype building meshes, a cemetery, a gravekeepers shack, a cafe some barrels, shovels, crates, pots, bottles, candles, rope, sign post, tables, chairs, beds - and some papers.

The system I'm using is an AMD 4200 with 2Gb RAM, 512Mb Radeon HD2600 graphics card.

Any solutions?