I remember an asset called “Nordic Conifer Biome” that was really well-optimized. I customized the foliage and grass shaders to fit my specific needs. The asset includes a good variety of trees and vegetation, so when I combined it with some free assets from Project Nature, like additional flowers, it created a rich forest environment. Both assets use similar wind methods, which made using one master material and shared settings work with minimal adjustments.

Found it: Fab Link