The fps in my game is very low, and all i have is a terrain, a character controller (with muzzle flash effects) and a camera with motion blur and anti aliasing and some gui. I dont have Unity pro so i have no way of checking what the problem is. Suggestions? When i play small screen i get around 45 fps, and in maximize on play mode and also a developer build had around 10-20.
Even without Unity Pro you can check what the problem is. Just deactivate more and more Components, especially scripts, until you notice that the FPS drop stops.
Its most likely because of your terrain. Check the settings and it is default set to something really, really high res. Just lower that and it will fix all of your problems.