Welcome to the Mystical Forest, where sometimes things are not quite what they seem and enchantment is sometimes just around the corner.
Med-resolutions meshes. with high weight textures (2048×2048). you can use “Decimate” option to reduce points/polygons and optimize your mesh for optimal speed. (Object/Edit Object) – (Polygon Mesh Options). Trees was grouped, ungroup and resave your trees. Tip: you can save diferent decimated versions for optimal use of ecosystens.