Saved documents
are
retrieved in multi-threaded mode.
When you retrieve a large part, drawing, or assembly document, the document
immediately displays in a view-only state while the actual document and all its
components are retrieved in the background.
During the view-only state, you can use
functions like Zoom and Rotate, but you cannot switch to another document or start
to open another document. After the retrieval is complete,
SOLIDWORKS changes to the normal edit state.