Stumbled upon this on the Unity forums. How useful is

>>520044
Not very, especially since we can't see what's faster than Vector3.Lookat() in Update.

I figure they're talking about removing the rotational component from the ModelView matrix in a vertex shader, which is actually explained here:

http://www.geeks3d.com/20140807/billboarding-vertex-shader-glsl/

>>520169
you can do that, but its fake billboarding and you wont ever get a smooth transition from billboarded to non billboarded

idk swap shaders