@ace94
I'm not sure what specific memory consumption you are talking about...Geometry or Texture?
I'm going to assume that it is texture consumption.
If it's texture, I suggest using Scene Optimizer by V3Digitimes to select the hair and lower all textures by 50% (to 2K textures). Additionally, you can remove some of the other maps from the hair that you don't really need.
If it's geometry consumption, I'd suggest using the same tool but lowering 1) the Render Preview SubD level to 0 and Render SubD Level down one level.
I know that adding dForce to an object increases the geometry count alot. I also know that DAZ merchants usually attach 4K TIFF textures that will spike up texture consumption significantly.