There are a couple of obvious problems with Unity trees and SpeedTrees related to billboards. There are two situations here and the problem is opposite for Unity trees versus SpeedTrees: 1) When the whole tree is a billboard. This is correct on the SpeedTrees but not correct on the Unity trees. On the Unity trees the entire billboard changes direction with the camera. Just do whatever you're doing for the Speedtrees there and the "whole tree billboards" will be perfect. 2) When you're up close and the leaves/branches are billboards. This is correct on the Unity trees but wrong on the SpeedTrees. On the Speedtrees the billboards change direction with the camera. So here too, just do whatever you're doing for the Unity trees and the "individual leaf group billboards" will be perfect. (EDIT: This only happens on some of the SpeedTrees. I was using broadleaf which does it, but just tried American Elm from the Speedtree Desktop Tree Package and it worked correctly.) Performance: Just tested and I'm seeing something like a 70% increase in performance on large scenes composed of nothing but SpeedTree billboards. This is a big improvement, the batching is now comparable to what it is on the Unity trees, but the Unity tree billboards are still something like 10 or 15 times faster. So while I was happy to see an improvement, it's a little disappointing that batching things up differently didn't bring SpeedTree billboards into the same ballpark as Unity trees. Speedtree billboards are still not fast enough for me to use in my project, sadly, even with wind and all the fancy stuff turned off.