In addition to these issues, keep in mind clothing and props are designed to work with the mesh as it was build.. reducing the mesh density will most likely create a lot of popthrough when using clothing. For static building car or prop type meshes, it can be useful. For characters, be prepared to almost rebuild them from the base up again. I reduced the Daz Martian Tripod's mesh to about a 3rd of it's original mesh density, and there is very little noticable difference.. but I also spend the better part of a full week finding out what parts could be reduced, and how much they could be reduced, before they were no longer pleasing or useful.

Way too many people take way too many things way too seriously.