Well, a lot of people tend to make models without thinking of the consequences in poser. So, maybe you use 50 or 100 sides for every cylinder to make them look nice and smooth. Or make boxes and cubes with 20 sides. Totally unneccessary. I'm not dissing you. I know, because I used to do it myself in max. Then I wised up and started measuring the releationship bewteen the model in max, and the model in poser. And it can be terrifying. The thing is, it doesn't look as though you've gone over the top. For instance, on the very bottom ring, I can see the sides, so it couldn't have more than 30 or 40. I'd check some of the smaller pieces and see if you can cut down the number of sides and segments. If they're abnormally high, you may have to bite the bullet and redo them. I know all about it. I've had to do it too. mac PS What exactly is 'so large'? I mean, what size is the obj file? You can also remove normals, which poser doesn't use. That'll cut maybe 20% off the file size.