Video playback "choppy" when play 2 full HD videos together

Hi,
Recently I have a project that is to have 2 full HD video playback on 2 full HD resolution monitors. I am using flex in Air by having 2 windows opened when the program is launched, auto fullscreen on both monitor and then play videos. The videos are in f4v format. But the problem is the video playback is "choppy" when playback 2 full HD video together. My development PC is Corei7 920 with Geforce GTS250. This project will actually runs on Corei7 2600 with intel graphic chipset PC which I haven't test on the performance.
How can I solve the "choppy" playback issue? Thanks.

Flash Player full-screen video is an intensive process, but because it's running in a 32-bit environment it doesn't really help if the hardware has loads of extra RAM and multi-core processors. As you're using the decoupled version of the Acrobat Family, it only has an impact in terms of the decompression of the stream data when the annotation first activates.
What is the original video spec?
Are your rich media annotations set to deactivate automatically when the user moves to the next page? By default they deactivate only when the user context-clicks, so you can have a series of inactive-but-loaded instances fighting for attention.

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