Flash performance inside mx:HTML in a Flex AIR app

Hi. I'm new to AIR development and after doing some basic tutorials I thought I'd make a little stream player app.
The amount of tutorials on the web made me choose Flex / Flash Builder over HTML & JavaScript. When I built the player in Flex I saw performance was terrible when out of focus, I would say it drops to 3 fps if not less. Surprisingly when I downloaded someone else's similar app, his didn't have that problem. On closer inspection - he made it in HTML & JavaScript and HTML AIR apps dont suffer from the same problem.
Is there a fix for this Flex performance problem?
I've made a video demonstrating the difference between Flex & HTML for your convenience: http://www.youtube.com/watch?v=OU2mfELhSC4.

Sure.
1.
Windows 7 Ultimate, 64bit, build 7600.
Adobe AIR 2.0.3.13070.
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.
2. http://pastebin.com/AsdmD3Yb
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.

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