I don't think Adobe have given any explanation. Neither have they given any sign that they are working on fixing the performance and stability issues. It seems to me that Adobe's position can be summed up like this - "That's not a priority for us. Learn to live with it." As an example of this there is this mini-flamewar between John C. Welch and Adobe's John Dowdell: <a href="http://www.bynkii.com/archives/2009/06/doing_it_wrong.html" rel="nofollow">http://www.bynkii.com/archives/2009/06/doing_it_wrong.html</a>