Since Daz textures are often unnecessarily detailed and large, the Daz Importer includes a tool to lower the resolution and size of the textures, see http://diffeomorphic.blogspot.com/2019/10/resizing-textures.html. However, I recently noted a problem when it comes to resizing normal textures in TIF format: the resized normal textures react very differently with light than the original ones.
It is not yet clear to me if this problem is specific to TIF files, or if similar problem would arise if the normal maps were stored in a different file format. However, in practice TIF files are rarely used except as normal textures. The latest commit has a workaround for this problem: we can now choose which file types are downsized.