Hi Seth, is it possible for you to send the file to me at moi@moi3d.com so I can take a look at it?

You will probably need to use a file sharing service like dropbox, etc... and send me a link to it.

There isn't much information that I can give you without seeing your particular file, that sounds like an unusual problem on a not too heavy file like you're describing but maybe there is some unusual geometry in the file like some kind of super tightly folded surface which is generating a huge mesh.

But anyway since your problem is likely to be specific to that one file I would pretty much need to see it to give you any better information.

- Michael