My experience has been than complaining into HN does not result in changes to software. Have you submitted a profiling dump to YouTrack?
I have a lot of sympathy for someone trying to make an IDE (or any introspection tooling) because the number of ways humans can come up with to organize or author code is unlimited. So, I'm sure they would welcome feedback on "hey, watch out, modeling templates using this mechanism has bad perf in this IDE component"