I'm not sure what could cause this, but note that in PL/SQL Developer 16 you can assign a function key to the "Editor: Comment/Uncomment Line" function. By default it is Ctrl -.
Can you go to Preferences > Oracle > Connection, and check if the "Check connection" and "Check all sessions" options are enabled? If not, can you enable it and try again?
We'll add a "Copy Name" item to the popup menu. A function key like Ctrl-C will not work, because when you click on an item in the Code Contents, the selection and focus immediately goes to the corresponding code in the editor.
The AI Assistant does indeed execute this query once to determine all table names accessible to the user. It can then find the table names in your prompts and in your SQL and PL/SQL code, so that it can include the table definitions as context.
I see that the query does not comply with the "Use...
Thanks. As a test, can you go to Preferences > User Interface > Code Assistant, disable the "Describe Context" option, restart PL/SQL Developer, and try again?
If it is still slow, please send me a new debug.txt file.