The "--process-per-site" switch, btw, only consolidates processes for tabs of the same site. So if you commonly have numerous pages open of the same site, great, but I think most people have a variety of sites open, making any savings realized with this switch minimal to non-existent.
I'm also not a fan of needing to use switches for cache location and size. What decade is this? The least they could do is stow it away in about:flags if it's too lowly for Settings.