In the statusbar of EA3 it says 'Comparing <PACKAGE NAME> body subprograms' for some time after loading a package from the database into the editor.
I wonder what SQL developer is doing right then; what is it comparing with?
It sometimes generates multiple processes (laptop fan whirring in overdrive)
Piling on - I'm facing the issue as well in V4 - has there been a new thread created yet? If not, I'm happy to create one (couldn't find one)... The "calculating breadcrumbs" issue will often hang my SQL Developer windows session and I have to kill with Task Manager...