I have sympathy, debugging is hard! But it's weird that across hundreds of threads no one from the dev group has anything to say, or that there is not disclaimer or "ask for help" or whatever.

"Yes we are aware that a certain percentage has severe performance problems on osx, we believe this has to do with the Retina displays blah blah" - instead it seems like no one from the dev group has been following this problem when you ask them. Despite weekly threads, just like the posts here on Hackernews in every FF thread.