When you sign in to OrgVue the system has to load all the datasets you see in the various tabs. The more of these there are, the longer it takes to sign on.
If there are datasets which you are not using, but don't wish to delete, you can archive them. This keeps them available for use, but they won't interfere with the sign-on process.
All you have to do is to tag a dataset with 'archived' : -
Once you have done that it will disappear from the tab.
You can find it subsequently by using the search option like this : -