obz doesnt really solve anything , the file is decompressed when loaded. Check the polygon count and if it say 60,000 polys then its ok  60-100 thousand polygons is about one figure with clothes.

Theres probably a ton of polygons inside that hull. I would select all the exterior polygons and invert the selection, then delete those polygons . You will need to deselect some stuff after inverting.

If you would send me the model in a zip file , I would be happy to have a look at it for you .
my email is marks542004@yahoo.com - please put renderosity in the subject line .