Learn to use the Backline Trees texture and create your own
CGVray 3D Architectural Visualization CGVray com Backline Trees
Learn how to use these tree lines as a texture and you will save a lot of ram in your scenes. it will work much better.
You can download some of them ready to use in this link to GOV3DSTUDIO website.
Thanks to Govinda for share.
DOWNLOAD FROM GOV3D