Ben over at Laminar Research has taken the time to address the AMD performance issue again. Even though this doesn’t change much right now, I think this small amount of communication will turn down the heat a little. Here’s what was posted:
Finally, one last note on ATI Windows performance – I know everyone is itchy for an update, but here’s the thing: we have NDAs with AMD, NVidia, Apple, and Intel. Therefore when we get information from them, I can’t post it here. So unfortunately whether a bug is not being looked at, being looked at, understood, being fixed, or already fixed and just waiting to make it into some kind of release, I have to say the same thing: very little. I know that that’s frustrating, but I think we’re better off having close relationships with these companies and being able to solve these problems. If there’s ever a chance to put a work-around in X-Plane, we do that.
So I can’t give you any new news on ATI Windows performance, and I am sorry about that. I can only say that it is my top priority. [source]