I'd like to improve performance on a fairly complex family I built for a window. I'm trying to search around for pointers but am having no luck. Can anyone offer a thread or suggestions? Loading into a project, placing it in a project and changing a simple instance checkbox all seem to take longer than they need to. I think it will drive my coworkers nuts unless they can keep it in there mind how much a little extra wait will save them in coordination efforts. One quiestion the comes to mind is... Does the number of nested levels really affect performace? If, so would I gain much by only nesting at the main family level?