Would you like to DeferUpdate disables any search by the model.
Today when we use the Defer Update on a drawing file, the file disables the creation of views and other features, but keeps the link to the model somehow.
This may be noticed as used in Project the Option (Yes) in the Unique Name files , Inventor performs a search in the paths entered in Project, checking the files with the same names . Thus creating delay in opening drawing files.