Thanks for bringing this up. Would it be possible to give some clues about what you are doing?
1. Please mention the AIR version and the OS version. Have you noticed this issue on other OS?
2. Can you post a code sample showing the problem you are experiencing?
Windows 7 Ultimate, 64bit, build 7600.
Adobe AIR 188.8.131.5270.
Unfortunately I only have machines with the exact same OS install at my disposal right now but I'll ask some people to test it on their boxes.
When I point the mx:HTML to a youtube url instead of ustream.html the fps drops around to around 5 to 10. That's a lot more fps than when using ustream. Might be a clue to whats happening.
Thanks Chris, that solved it.