Hi, this question has bugged me for a while and I have never been able to find a sure answer on it!
I use LOD bias on textures to scale them down for optimization, however, I have wondered if this is as effective as re-importing the textures at the desired scaled down resolution.
I believe on package it actually gets scaled down, so the end result is the same in file size/performance. However on play in editor the full texture still gets loaded.