Will 4.6 light build require more ram?

Hey !
I was wondering , with the new statics lighting on instanced meshes feature in 4.6 , will building light take alot more ram ? I have a fairly large scene with a ton of trees , I had to play around alot with settings before I could build static lighting on my 16gb machine , at the moment it takes about 11-12 gb to build it . If before instanced meshes didn’t get static lighting then upgrading to 4.6 might render my scene absolutely unbuildable .
Will it ?