Painting a large forest or using a spline with a forest generator causes the editor to have a severe performance hiccup and hinders game performance as well, due to an error that is being spammed in the console. There seems to be no auto occlusion when using the generators, and I can not find any documentation or information regarding optimization for large forests or areas of entities.
ENTITY (E): Huge number of entities (52815) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52816) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52817) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52818) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52819) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52820) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52821) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52822) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52823) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52824) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52825) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000> ENTITY (E): Huge number of entities (52826) per scene tree leaf! Center position <6375.000000 1920.000000 6375.000000>