I don't think it is a bandwidth problem, but maybe the CPU is getting overloaded. Flash can be quite CPU hungry anyway. If you add the CPU needed to re-encode it into DisplayLink compression for sending over USB, it might top out the CPU.
I would try lowering the screen resolution (flash videos tend to be lower res anyway, so you wouldn't notice full screen) and see if this improves performance. A lower screen resolution means less pixels for us to compress in full screen mode, so less CPU needed, so higher frame rate.
Wim
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