[J93Wagner]

I'll admit it, I also want a solution to how to get around it, and although when I encountered it, it wasn't so painfully slow (only about 5-10 second delay time), it was indeed very annoying and frustrating. So, it's for that reason, or a similar one anyway why I would rate Inventor 2010 better than 2011 (although I would say it is pretty close, 2011 improved on 2010 a lot in getting around to what needed to get done).

/rant

But anyway, you mentioned that you constrain every bolt and washer you can. Part of the problem might be because Inventor tries to render every single part before moving. While I doubt it is the major factor as to the slowing of your computer, it might help a little bit and get things done more efficiently.

Otherwise, try to do everything you possibly can in sub-assemblies to make the chunks you have to work with as small as possible, thus the least amount of rendering that has to be done.