Controls the density of scattered objects, allowing to specify how closely or sparsely the objects should be placed in a particular area. Users should be observant of their density values, as a very high number could in turn affect the performance of the scene.
A smart way of utilizing this property would be to alter your density based entirely on the rendering cameras. For example, having a density of 5000 grass objects is a nuisance with performance and even more so if it is hardly visible in the shots you would like to render.
Density can be altered at any of the following two scenarios: