Well, that is no justification for any slowdown. The "code model" does not need to be complete the moment I start an IDE or open a file or project in it. A temp

Well, that is no justification for any slowdown. The "code model" does not need to be complete the moment I start an IDE or open a file or project in it. A temporarily incomplete model is very acceptable. More work can be put off to a background thread. It can be delayed until I perform the first action, that actually needs a complete model, like say a renaming of something. There are relatively few actions like that. Many facts can already be concluded from import statements in various languages. Furthermore we are fighting a strawman here: Who in their right mind opens a 100k line code file in an IDE? And who in their right mind creates such a disaster in the first place? This is not a realistic scenario we are talking about here.