I'm testing Unity for a game that I'm building, and I've touched its limit.
My test scenario: a wanna-be house with 200 elements (cubes rescaled) no textures, box colliders and rigid bodies for each "cube" and fixed joints to hold them together (400+ fixed joints). The house is on a plane, and above it I put 2 sphere at different altitudes, spheres which will crash in the poor house.
This moves very slow on an iPod Touch 3rd generation. Therefore I'm looking for some documentation to create a reasonable budget for the number of polygons, physics collisions and so on. What is your recommendation?